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3200 fps with a 220 gr Sierra ?

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d4570 View Drop Down
.416 Rigby
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    Posted: 28 February 2021 at 13:43
HUMM think it's OK?
We where out today trying some 8mm RM loads.
I have some original Rem Factory 220 gr rounds.
We ran them over our Speedometer and got 2750 FPS.
Just forward of the "Band" we mic'ed it at .505 before shot and .512 after.
A one 1 1/2 " group ( dang windy today).
I have a load we worked  up with the same sierra bullet.
Speed runs right at 2990 to 3000 fps.
I shot a 1 inch at 120 yards. It Mic'ed at .512 and did not expand.
No sighs of presser.
I was looking for more, don't know what but always looking.
Like 5000 FP of energy is not enough...
We got some reloader 26 ( finally), it is supposed to be great stuff. There is little to NO load info, so I'm not going to list the charges.
I had a guy do a Quickload work up on it and got some data.
At the Minimum load we got just under 3000 fps, on sign of presser
and no expansion. Groups where over an inch.
A bout 25% over min we got right at 3100 fps, about the same for groups, little more then our worked up loads.
Then we tried a charge about 2 GR under max.
We got a smidgen over 3200 fps and only slight sign of presser, primer a little flat but still very easy bolt lift, the explanation went from .512 to .5125. 
Still safe in my mind at 20* but I don't know what it would be at 90*  Is 200 fps increase over any published speeds out of line?
The group did open to just under 2 inches.
That is still better then the published groups.

Here are some published loads for a sierra 220.
220 Sierra SBt Alliant RL-25 2965 FPS 2.95 inch groups
220 Sierra SBT Ramshot Magnum 2825 Fps 2.97 Inch groups.

Should I go on? 
How fast is to fast?
If I go on I would want better groups then 2" at 120 yards.
Maybe have to adgust the "Jump" to see an improvement.

 




Edited by d4570 - 28 February 2021 at 14:41
Remember: Four boxes keep us free ,the soap box, the ballot box, the jury box, AND the cartridge box
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Irish Bird Dog View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Irish Bird Dog Quote  Post ReplyReply Direct Link To This Post Posted: 28 February 2021 at 21:08
Mmmmm....lots of testing to find new loads...harder without much starting data.
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Wing master View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Wing master Quote  Post ReplyReply Direct Link To This Post Posted: 02 March 2021 at 00:28
Reloader 26 is unicorn dust. very hard to find. It is also very temperature stable. I think you will be ok next summer. 

That's a big hunk of lead moving at a pretty good clip. I think I would look for the most accurate load. 

We both live in areas where the chance of a lifetime shot could be 400 yards or more. I'm pretty sure you have enough energy but I would go for accuracy thinking I want to be confident of a hit at 400 or more. 

Wing master


Edited by Wing master - 02 March 2021 at 00:29
I have always considered myself to be quite the bullshitter, But ocasionally it is nice to sit back and listen to a true professional......So, Carry on.
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