Which scope

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TexasMac
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Joined: Sun Nov 04, 2007 5:29 pm
Location: Central Texas
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Re: Which scope

Post by TexasMac »

TexasMac wrote: Mon Jan 27, 2020 7:34 pm Keith,
I can't give you any "come ups" since I have never shot past 500 meters. But will say that's a bunch of powder in a .40 caliber & a flat shooting bullet with only 38 MOA (apparently Brent's math skills leave a little to be desired :lol:). If it's a .40-65 then you're must be using mucho compression? In my Browning .40-65 with 69gr of Swiss 1.5 behind a 402gr "money bullet" the verified velocity is 1330fps. With that load the difference from 200 meter to 500 meters is 49 MOA.
I stand corrected. I grabbed the wrong data for the above comments. Actually the 200 to 500 meter sight difference was 43 MOA with a velocity of 1330fps in the Browning .40-65 with 69gr of Swiss 1.5 behind a 402gr "money bullet".

And FWIW, I just checked recent match data for my Sharps .40-65 with a 414gr "money bullet" ahead of 55gr of Swiss 1.5, resulting in 1225fps. The 200 to 500 meter sight difference was 52 MOA.

Wayne
NRA Life (Benefactor & President's Council) Member, TSRA Life Member, NSSF Member, Author & Publisher of the Browning BPCR book
http://www.texas-mac.com
Perentie
Posts: 417
Joined: Mon Jul 21, 2014 9:22 am
Location: Queensland, Australia.

Re: Which scope

Post by Perentie »

Thanks everyone that replied and for Brents Graph. That all should get me close.
Later when I get organised I will plot a graph as well just to get the curve. I did not think it would be linear but more of a parabola.
I remember reading articles in Gun Digest from back in the 60,s (still Have them) on plotting the mid range trajectory of any cartridge.

Keith
BFD
Posts: 2789
Joined: Mon Jan 21, 2008 7:36 pm

Re: Which scope

Post by BFD »

Keith, it almost has to be parabolic, but over the range of targets we shoot, it's still pretty darn straight. I'm sure a 2nd order regression would be the best fit.
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