7.62x39 ballistic coefficient

[spartacus2002]

I'm trying to zero my 16" SKS for a 250yd Battlesight Zero.

My usually-strong Google-fu is weak on this issue. I have a ballistic calculator, but I need the ballistic coefficient of the Wolf 124gr HP 7.62x39mm ammo.

 

[GunGoBoom]

this may not help but....

Well, I dunno about the wolf, but here are some BCs for .30 cal bullets (these are .308, not .311, but still they should be close):

Hornady 123 gr v-max: .275
Hornady 123 gr sp: .252
Hornady 123 gr fmj (discontinued): .266
Speer 125 gr tnt hp: .326
Speer 130 gr hp: .263
Speer 130 gr flat-sp: .248

I'd imagine the fmj bullet would be in the .275 range. In any event, may I suggest that a more useful/appropriate zero for a 7.62x39mm rifle is either 100, 125, or 150 yards. Just MO, but if you're planning on fighting rather than retreating at ranges beyond 150 (I wouldn't), then I'd say get a flatter shooting rifle. You are 6.21 inches high at 150 yards with a 250 yard zero, a BC of .275, and a MV of 2350!! Unacceptable IMO for what is a short range battle/defense rifle!

 

[benEzra]

I'd suggest zeroing at 100, personally. If you do, you're right on at 50 and only a couple inches low at 150, and at 200 you're still off by less (>6") than you would be at 100 if you sighted in at 200.

Personally, I'd keep the rear sight set on 100 and zero the rifle at 100 yards/meters, and if you need a longer shot, crank the rear sight to the appropriate distance setting (assuming you're using the iron sights).