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How to measure scope sight height

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samchap View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samchap Quote  Post ReplyReply Direct Link To This Post Topic: How to measure scope sight height
    Posted: 11 September 2016 at 12:38
I'm going to do something I should have done years ago.
That is sight in my Win 70 for a zero at 200 yards or
so. I shoot rem core-lokt 150 grain PSP and have always
sighted in for 1" high at 100 yards and called that good
enough for what distance I was normaly shooting to. This
fall I will be trying some bogs that just might push me
to 200 yards plus. I have been looking at ballistic
trajectory charts and what I have seen so far are based
on 1.5" or 2" sight height. Question: How is sight
height determined?

What I am looking for is being able to hold dead on and
`be within + or - 3"-4" of that. I guess a follow up
question would be, Does it make that much of a
difference?

I am going to get a range finder for the bog hunting for
the obvious reason. I think using that will be a
confidence builder.

I've never hunted in the open before so this is going to
be a fun thing for me. Yes I've seen the 'yote pictures
and all I can say is that open has different meaning
depending on your location. Kinda like what hot means to
someone who can drink Texas Pete and what hot means to
someone who never goes beyond a few drops of Tobasco
Sauce and sauce and calls that hot enough.
samchap - Waldoboro, ME








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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: 11 September 2016 at 14:32
Samchap for the record are you going to be hunting "bogs" or HOGS???
I'd guess a Bog would be easier to hit than a HOG so less precision would be needed if you are indeed Bog hunting.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote CB900F Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2016 at 14:49
Samchap;

Do you have, or have access to, a chronometer? Unless
you can determine the speed of the bullet to a reasonable
state of accuracy, all trajectory charts etc., are just
educated guesswork.

However, having the experience with the .30-06 & 150
grain bullets that I do, if you don't have a chrono go
three inches high at 100 yards. Using the online JBM
ballistic calculator, I gave a muzzle velocity of 2850
fps with a 150 grain spitzer bullet & used a B/C of .377
- which would be typical & I found it in the Speer
manual. I then said that the vital zone diameter was 6
inches. That gave me, and my experience confirms it, the
following:
+3" at 100 yards. +2.6" at 200 yards. -3.6" at 300
yards. So, your maximum point blank range is 282 yards.
Point blank zero is 242 yards. In other words, put the
crosshairs on it at any range up to 282 yards & under
ideal conditions the bullet will not impact up or down
more than three inches from the crosshair sight point.

The 3" high at 100 really should work very well for you
at any reasonable range you've told us you'll encounter.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote RobertMT Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2016 at 15:47
Sight above bore, is center of scope to center of bore, I just eyeball using a ruler, alongside bell of scope and bore, it'll get you close enough.

It matters, but under 500yds isn't critical.

Either two inches high at 100yds, for under 250yds or three inches high, for up to 300yds work. The trouble with three inches high, is at 150yds or so, you'll be 4" high and if you need to thread the needle or take neck shot, it can matter. I find it easier to remember to hold high, than low.
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samchap View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote samchap Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2016 at 18:06
IBD...BOGS as in a wet place with open water in places but
mostly grass and moss hummocks and cranberries..... You
agigator.

CB...I've been to these bogs before and 200 yards is the
most distance I expect to shoot at but I was not thinking
of hunting them when I was there so a range finder might
be more accurate than my memory.

R.MT...Thanks, that will work just fine.
samchap - Waldoboro, ME








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Post Options Post Options   Thanks (0) Thanks(0)   Quote BEAR Quote  Post ReplyReply Direct Link To This Post Posted: 12 September 2016 at 01:07
A Bog is a place where dying moose like to go!

I like 2" high at 100 yards, for the reason that
Robert said. that way If under 200 yards it is right
on. When I see a 300 Yard shot, I know it is a far
shoot and just 'hold over' 6 inches. Long shots
usually give me time to think, and figure the hold
over. Short shots often don't give one time to think
about trajectory.

Re: scope height. I have a wooden ruler, and just set
it on the top of the stock beside the scope (that is
about the bore center line. Then measure up to the
center of the tube. seldom a perfect 1.5 or 2 ".
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