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load development - 7x57 mauser

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TasunkaWitko View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 10 September 2007 at 08:11
TasunkaWitko - Chinook, Montana

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe in KY Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2007 at 07:51
Hi everyone, I just found this forum. Seems like there are quite a few 7x57 fans here. I have owned a couple of them over the years and have only used bullets in the 130 to 145 gr range. I like the 145 Speer BTs the best. I am have a rifle built in 7x57 and have been looking at various bullets and it looks like I have been limiting myself way too much, the 160s especially the Hornady SSTs and A-Max bullets look real good on paper. Joe in KY
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2007 at 10:06

Welcome Joe, Lots of good info here, welcome to the site, feel free to jump in and enjoy.

 

Rick

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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 17 September 2007 at 07:41
bad weekend for testing loads - i was going to test my handloaded 7x57 rounds sunday morning, but the breeze was such that i decided against it, especially since i do not have a gun vise/rest and would be relying on blankets and ammo cans.

the "breeze" eventually developed steadily into quite a fine north-central montana windstorm, with clouds of dirt and dust moving along about as fast as the cars on the highway.

i am hoping for some more congenial weather next week; or, at least not
as much wind.
TasunkaWitko - Chinook, Montana

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Joe in KY Quote  Post ReplyReply Direct Link To This Post Posted: 19 September 2007 at 19:15
I have ordered a 1:8.66 twist barrel for my 7x57 project.  I plan on shooting heavier bullets most of the time what is the lightest bullet any of you have found to be accurate with this twist?  thanks Joe
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 14 October 2007 at 11:10

I finally have some new information and a range report. The weather today in north-central Montana was about as beautiful as can be this time of year. No wind, nice temperature and clear skies. As a reminder, here is what we had:

 

  • Rifle – CZ M550 American (7x57)
  • Scope - Sightron S1 (3-9x40mm)

The ammunition being tested was loaded as follows:

  • Winchester brass
  • CCI primers (standard)
  • Hornady 139-grn PSPs (flat base)
  • 5 rounds of each load (see below)


When we got out there, two high school kids were sighting in and doing a good job of it. The range has only two "lanes," so we waited a while and got ready while they finished up. After they left, we set up targets at 100 yards and proceeded.


We shot a total of six 5-shot groups with at least one minute between shots and at least 5 minutes between groups. The barrel did get warm, but not hot. The bore was slightly fouled but not dirty.


For Christmas, I am definitely asking for a rifle rest or vise. As it was, I had a standard gun cradle for cleaning and mounting scopes. It worked well as a rest for holding the rifle reasonable steady, but it was impossible to set at a particular height and there was way to hold it tight in place. I ended up setting the front end on a folded jacket and managed to get it close to the height I wanted, and then held on-target from there. As a consequence, conditions were a little better than off hand, not nearly as good as bench rest. Perhaps a decent approximation of field conditions using a backpack or some similar informal rest? In any case, all measurements below should be taken with a small grain of salt, since they were not under “perfect” conditions.


While we were there, a father and his high school-aged daughter also came out to sight in her .243 for opening day. They were having a good time and it was nice to see a young lady participating in our sport.


Results were as follows (groups are measured from edge-to-edge at widest point, not center-to-center – 7mm translates to .275 inches, which should be subtracted from each group):


IMR 4064


  • 38 grns – One shot missed the target, leaving a wide four-shot group measuring 3.05 inches (net - 2.775 inches). The “center” of the group was approximately ¾ inch above and 1¼ inches to the right of the bull’s eye. One case ended up with a split neck for unknown reasons.
  • 39 grns – All five shots hit the target in a group measuring 2.61 inches (net - 2.335 inches). The “center” of the group was approximately ¾ inch above and 1 & 1/8 inches to the right of the bull’s eye. Were it not for a flier, the group would have been 1.89 inches (net - 1.615 inches)with the “center” ¾ inch high and ½ inch to the right of the bull's eye.
  • 40 grns – All five shots hit the target in a nice group measuring 1.75 inches (net - 1.475). The “center” of the group was approximately 1½ inches above and ½ of an inch to the right of the bull’s eye. This group was interesting in that it was actually 2 groups; a three-shot group 1½ inches above the bulls eye measuring .74 inches (net - .465 inches) and a second group of two shots nearly through the same hole and about an inch to the right. It seemed to me to ultimately be the best group of all.

IMR 4831


  • 44 grns – All five shots hit the target in an erratic group measuring a full six inches across, with an apparent flier at each end, left and right. The “center” of the overall group was a nice little group of three shots (almost a cloverleaf) measuring .71 inches (net - .435 inches) and placed approximately 1¼ inches below and 1/3 of an inch to the left of the bulls eye. This load certainly bears more attention in order to find out whether the fliers were shooter error or a problem with the load.
  • 45 grns - This group was tainted by all kinds of misery. During the third shot, the rifle discharged as yours truly was switching off the safety with his finger on the trigger (which is quite sensitive!). This provided the kids with a visual lesson on rifle safety as well as range safety. STAY BEHIND THE FIRING LINE! Anything can happen. As a further complication, one shot missed for whatever reason. This left us with a three-shot group measuring 1.37 inches (net 1.095 inches). The center of the group was approximately 1/8 of an inch below and ¾ of an inch to the right of the bull’s eye. Without the miss and the accidental discharge, this might have been a decent group, but there is no way to know for sure.
  • 46 grns – one shot missed the target, leaving a box-shaped four-shot group measuring 2.34 inches (net - 2.065 inches). The “center” of the group was approximately 1 inch to the right and ½ of an inch below the bull’s eye.

Conclusions: Even though there was no completely secure rest, the fact remains that conditions were more-or-less the same for all six groups. With that in mind, the 40 grains of IMR 4064 seem to have performed the best and I will be using that for hunting this year. Having seen a “pretty darn good” group with it, and considering that it lands with very good consistency an inch-and-a-half above the bull’s eye at 100 yards, I have high confidence that it will perform well. Obviously, some tweaking will be necessary in the future, but all things considered, this looks good.



Edited by TasunkaWitko
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Rockydog Quote  Post ReplyReply Direct Link To This Post Posted: 14 October 2007 at 16:04
Tas, Looks like a promising start. Good luck with the load you've chosen to hunt with. RD
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 16 October 2007 at 03:55
with luck, i'll have time tomorrow to scan the six targets and post them in the report above. it might be good to have a visual, which may help with any analysis. from what i could see, there was no stringing (vertical or horizontal) but there might be something else.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote TasunkaWitko Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2007 at 04:20
assuming an approximate velocity of 2600fps, i worked up some numbers using the point blank ballistics program. here's what came out of the numbers:

Load Data
~~~~~~~~~

Name: .284 Cal, Hornady PSP - flat base, 139 grn
Ballistic Coeff: 0.392
Bullet Weight: 139
Velocity: 2600
Target Distance: 250
Scope Height: 1.500
Temperature: 45
Altitude: 3200

Ballistic Data
~~~~~~~~~~~~~~~
  Range  Elevation  Velocity   Energy     ETA         Drop      Max Y  10mph Wind Deflect
  0 yds   -1.50 in  2600 fps  2086 fpe  0.000 sec    0.00 in  -1.50 in    0.00 in
 25 yds    0.34 in  2549 fps  2004 fpe  0.029 sec    0.16 in  -0.56 in    0.04 in
 50 yds    1.84 in  2498 fps  1925 fpe  0.059 sec    0.66 in  -0.43 in    0.21 in
 75 yds    3.01 in  2447 fps  1848 fpe  0.089 sec    1.49 in  -0.22 in    0.41 in
100 yds    3.81 in  2397 fps  1774 fpe  0.120 sec    2.69 in   0.10 in    0.76 in
125 yds    4.23 in  2348 fps  1702 fpe  0.151 sec    4.27 in   0.51 in    1.25 in
150 yds    4.25 in  2300 fps  1632 fpe  0.184 sec    6.25 in   1.04 in    1.87 in
175 yds    3.85 in  2252 fps  1565 fpe  0.217 sec    8.65 in   1.68 in    2.62 in
200 yds    3.02 in  2204 fps  1499 fpe  0.251 sec   11.49 in   2.45 in    3.50 in
225 yds    1.74 in  2157 fps  1436 fpe  0.285 sec   14.76 in   3.35 in    4.50 in
250 yds    0.00 in  2111 fps  1375 fpe  0.320 sec   18.50 in   4.39 in    5.61 in
275 yds   -2.21 in  2065 fps  1316 fpe  0.356 sec   22.71 in   5.57 in    6.84 in
300 yds   -4.90 in  2020 fps  1259 fpe  0.393 sec   27.40 in   6.89 in    8.18 in
325 yds   -8.17 in  1975 fps  1204 fpe  0.430 sec   32.68 in   8.40 in    9.73 in
350 yds  -11.87 in  1931 fps  1150 fpe  0.468 sec   38.38 in  10.04 in   11.29 in
375 yds  -16.21 in  1887 fps  1099 fpe  0.507 sec   44.72 in  11.89 in   13.08 in
400 yds  -21.21 in  1844 fps  1050 fpe  0.547 sec   51.72 in  13.95 in   15.09 in
425 yds  -26.90 in  1802 fps  1003 fpe  0.589 sec   59.41 in  16.24 in   17.29 in
450 yds  -33.30 in  1761 fps   957 fpe  0.631 sec   67.80 in  18.76 in   19.69 in
475 yds  -40.42 in  1721 fps   914 fpe  0.675 sec   76.92 in  21.52 in   22.27 in
500 yds  -48.27 in  1681 fps   872 fpe  0.719 sec   86.78 in  24.53 in   25.02 in
525 yds  -56.88 in  1642 fps   832 fpe  0.765 sec   97.39 in  27.81 in   27.94 in
550 yds  -66.25 in  1604 fps   794 fpe  0.811 sec  108.76 in  31.35 in   31.01 in
575 yds  -76.39 in  1566 fps   757 fpe  0.858 sec  120.90 in  35.17 in   34.23 in
600 yds  -87.32 in  1529 fps   721 fpe  0.906 sec  133.83 in  39.28 in   37.58 in
625 yds  -99.36 in  1493 fps   688 fpe  0.956 sec  147.87 in  43.77 in   41.25 in
650 yds -112.20 in  1458 fps   656 fpe  1.006 sec  162.71 in  48.57 in   45.03 in
675 yds -126.24 in  1424 fps   625 fpe  1.058 sec  178.75 in  53.79 in   49.10 in
700 yds -141.47 in  1391 fps   597 fpe  1.111 sec  195.98 in  59.43 in   53.45 in
725 yds -157.89 in  1359 fps   570 fpe  1.166 sec  214.40 in  65.50 in   58.02 in
750 yds -175.51 in  1329 fps   545 fpe  1.222 sec  234.01 in  72.01 in   62.81 in
775 yds -194.30 in  1299 fps   521 fpe  1.279 sec  254.81 in  78.95 in   67.79 in
800 yds -214.29 in  1271 fps   498 fpe  1.338 sec  276.79 in  86.35 in   72.95 in

Moving Target Lead Data
~~~~~~~~~~~~~~~~~~~~~~~
 Range       5 Mph     10 Mph     15 Mph     20 Mph     25 Mph     30 Mph     35 Mph     40 Mph     45 Mph     50 Mph     55 Mph     60 Mph
  0 yds    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft    0.00 ft
 25 yds    0.21 ft    0.43 ft    0.64 ft    0.85 ft    1.07 ft    1.28 ft    1.49 ft    1.70 ft    1.92 ft    2.13 ft    2.34 ft    2.56 ft
 50 yds    0.43 ft    0.86 ft    1.30 ft    1.73 ft    2.16 ft    2.59 ft    3.02 ft    3.46 ft    3.89 ft    4.32 ft    4.75 ft    5.18 ft
 75 yds    0.65 ft    1.30 ft    1.96 ft    2.61 ft    3.26 ft    3.91 ft    4.56 ft    5.22 ft    5.87 ft    6.52 ft    7.17 ft    7.82 ft
100 yds    0.88 ft    1.76 ft    2.63 ft    3.51 ft    4.39 ft    5.27 ft    6.15 ft    7.02 ft    7.90 ft    8.78 ft    9.66 ft   10.53 ft
125 yds    1.11 ft    2.22 ft    3.33 ft    4.44 ft    5.55 ft    6.66 ft    7.77 ft    8.88 ft    9.99 ft   11.10 ft   12.21 ft   13.32 ft
150 yds    1.35 ft    2.69 ft    4.04 ft    5.39 ft    6.74 ft    8.08 ft    9.43 ft   10.78 ft   12.12 ft   13.47 ft   14.82 ft   16.17 ft
175 yds    1.59 ft    3.18 ft    4.77 ft    6.36 ft    7.95 ft    9.54 ft   11.13 ft   12.72 ft   14.31 ft   15.90 ft   17.49 ft   19.08 ft
200 yds    1.84 ft    3.68 ft    5.51 ft    7.35 ft    9.19 ft   11.03 ft   12.87 ft   14.70 ft   16.54 ft   18.38 ft   20.22 ft   22.06 ft
225 yds    2.09 ft    4.18 ft    6.27 ft    8.37 ft   10.46 ft   12.55 ft   14.64 ft   16.73 ft   18.82 ft   20.91 ft   23.00 ft   25.10 ft
250 yds    2.35 ft    4.70 ft    7.05 ft    9.40 ft   11.75 ft   14.10 ft   16.45 ft   18.79 ft   21.14 ft   23.49 ft   25.84 ft   28.19 ft
275 yds    2.61 ft    5.22 ft    7.84 ft   10.45 ft   13.06 ft   15.67 ft   18.28 ft   20.90 ft   23.51 ft   26.12 ft   28.73 ft   31.35 ft
300 yds    2.88 ft    5.76 ft    8.64 ft   11.52 ft   14.40 ft   17.28 ft   20.16 ft   23.04 ft   25.92 ft   28.79 ft   31.67 ft   34.55 ft
325 yds    3.16 ft    6.31 ft    9.47 ft   12.62 ft   15.78 ft   18.93 ft   22.09 ft   25.24 ft   28.40 ft   31.56 ft   34.71 ft   37.87 ft
350 yds    3.43 ft    6.86 ft   10.30 ft   13.73 ft   17.16 ft   20.59 ft   24.02 ft   27.46 ft   30.89 ft   34.32 ft   37.75 ft   41.18 ft
375 yds    3.72 ft    7.44 ft   11.15 ft   14.87 ft   18.59 ft   22.31 ft   26.03 ft   29.74 ft   33.46 ft   37.18 ft   40.90 ft   44.62 ft
400 yds    4.01 ft    8.03 ft   12.04 ft   16.05 ft   20.07 ft   24.08 ft   28.09 ft   32.11 ft   36.12 ft   40.13 ft   44.14 ft   48.16 ft
425 yds    4.32 ft    8.63 ft   12.95 ft   17.27 ft   21.58 ft   25.90 ft   30.22 ft   34.53 ft   38.85 ft   43.17 ft   47.48 ft   51.80 ft
450 yds    4.63 ft    9.26 ft   13.88 ft   18.51 ft   23.14 ft   27.77 ft   32.40 ft   37.03 ft   41.65 ft   46.28 ft   50.91 ft   55.54 ft
475 yds    4.95 ft    9.89 ft   14.84 ft   19.79 ft   24.74 ft   29.68 ft   34.63 ft   39.58 ft   44.52 ft   49.47 ft   54.42 ft   59.37 ft
500 yds    5.27 ft   10.55 ft   15.82 ft   21.09 ft   26.37 ft   31.64 ft   36.91 ft   42.19 ft   47.46 ft   52.73 ft   58.01 ft   63.28 ft
525 yds    5.61 ft   11.21 ft   16.82 ft   22.43 ft   28.03 ft   33.64 ft   39.24 ft   44.85 ft   50.46 ft   56.06 ft   61.67 ft   67.28 ft
550 yds    5.95 ft   11.89 ft   17.84 ft   23.78 ft   29.73 ft   35.68 ft   41.62 ft   47.57 ft   53.51 ft   59.46 ft   65.40 ft   71.35 ft
575 yds    6.29 ft   12.58 ft   18.87 ft   25.17 ft   31.46 ft   37.75 ft   44.04 ft   50.33 ft   56.62 ft   62.91 ft   69.21 ft   75.50 ft
600 yds    6.64 ft   13.29 ft   19.93 ft   26.57 ft   33.21 ft   39.86 ft   46.50 ft   53.14 ft   59.79 ft   66.43 ft   73.07 ft   79.72 ft
625 yds    7.01 ft   14.01 ft   21.02 ft   28.03 ft   35.04 ft   42.04 ft   49.05 ft   56.06 ft   63.06 ft   70.07 ft   77.08 ft   84.09 ft
650 yds    7.38 ft   14.75 ft   22.13 ft   29.50 ft   36.88 ft   44.26 ft   51.63 ft   59.01 ft   66.39 ft   73.76 ft   81.14 ft   88.51 ft
675 yds    7.76 ft   15.52 ft   23.27 ft   31.03 ft   38.79 ft   46.55 ft   54.30 ft   62.06 ft   69.82 ft   77.58 ft   85.33 ft   93.09 ft
700 yds    8.15 ft   16.30 ft   24.45 ft   32.60 ft   40.75 ft   48.90 ft   57.05 ft   65.20 ft   73.35 ft   81.50 ft   89.65 ft   97.80 ft
725 yds    8.55 ft   17.10 ft   25.66 ft   34.21 ft   42.76 ft   51.31 ft   59.87 ft   68.42 ft   76.97 ft   85.52 ft   94.07 ft  102.63 ft
750 yds    8.96 ft   17.93 ft   26.89 ft   35.85 ft   44.82 ft   53.78 ft   62.74 ft   71.71 ft   80.67 ft   89.63 ft   98.60 ft  107.56 ft
775 yds    9.38 ft   18.76 ft   28.15 ft   37.53 ft   46.91 ft   56.29 ft   65.68 ft   75.06 ft   84.44 ft   93.82 ft  103.21 ft  112.59 ft
800 yds    9.81 ft   19.62 ft   29.43 ft   39.24 ft   49.04 ft   58.85 ft   68.66 ft   78.47 ft   88.28 ft   98.09 ft  107.90 ft  117.71 ft


this is certainly adequate for the deer and antelope hunting that i expect to encounter in the near future.
TasunkaWitko - Chinook, Montana

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 08 November 2007 at 08:20
I sight mine in 2 inches high at 100 yds, so it is about 2.5 low at 200 yards.  Anything over about 150 yds I laser the range, so flatness is not an issue.  a taped trajectory to 400 yards is taped to the off side but stock and then I know the exact hold.  Actually never killed anything over 210 with it, but that is only because I have other rifles and the opportunity never presented itself to me when I had the 7x57.  I'm sure it will kill anything I can hit with it.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote pintopete Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2008 at 07:02

Hi guys,  New to this forum. Glad I found it.  I have been working with my 7x57 M77 tang safety and was posting on another forum.  It is a long story so I will include a link to it. 

http://shootersforum.com/showthread.htm?t=40155

I am looking forward to making up some new loads and trying again. 

Thanks, Peter.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Guests Quote  Post ReplyReply Direct Link To This Post Posted: 21 March 2008 at 12:48

Welcome Pinto.

I read your whole long downhill thread on the M77.  You had lots of good information there.  I've got a 7x57 and a 257 Robert Rugers, both from the mid '70s.

I hope your new barrel works.  sort of anxious to hear if you still have the side to side "wiggle" of the stock.  Mine do not do that.

Welcome.  Looking forward to your range test.

BEAR

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Post Options Post Options   Thanks (0) Thanks(0)   Quote tj3006 Quote  Post ReplyReply Direct Link To This Post Posted: 04 July 2008 at 06:05

       Man I am teloing you try H-414 in the 7X57 and try RL-19.

    I had a CZ and it was dynomite using 150 and down with the H-414 and with the 160s I used RL-19. And it was super acurate.

    My #1A loves the 414 and I use other rounds If I want to shoot bigger bullets...tj3006

Freedom 1st tj3006
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