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Rifle Scopes Dope?

IdahoMike

I like Turtles.
Full Member
Minuteman
Nov 30, 2009
269
0
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12TUN8307946609
Went to the range for the first time in about a month. My zero is at 100 yards and my 400 yard dope was +8 MOA. Today at 100 I had to come up 2 MOA. So I thought to myself, self what could be the reason for this. I had heard that muzzle velocity will slow in lower temps because of density? Then I +8 MOA to shoot at 400 and was way freakin' high. I had to -3 MOA (net + elevation = 5 MOA) to be on target. I didn't have a chronograph but I fiddled with the muzzle velocity number in my ballistics calculator of which my muzzle velocity was 2525 fps., to get my 100 yard dope to match my 400 yard dope it says my muzzle velocity is sitting around 2985 fps.

any ideas other than I fucked the dog when I was loading and loaded exactly 50 rounds of my last batch hotter than usually?
 
Re: Dope?

I havent tested it but its in the works, same range, elevation, 15-20 degree temp change. Captain M. that would be cool, bring the chrono. too.

I didn't even think about it being my scope, der... I should chuck the damn thing in the river and get a better one. Thanks for the insight fellas.

Mike