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range results
went to the range to test a couple loads in the 16" and 20" 7.62x39USA
16" 1:8 Olmypic .078 gas port carbine length gas system, fire-formed brass...
125 TNT 22gr lil-gun = 2,540 fps
125 TNT 22gr H110 = 2,480 fps
125 TNT 22gr 296 = 2,475 fps
20" 1:12 Noveske .102 gas port rifle length gas system, fire-formed brass....
125 TNT 26.0gr 1680 = 2,606 fps
I think I've hit a stopping point with the 16" around 2500fps...my favorite loads have been with the 4227 and lil-gun around 2350 to 2450fps.....I can probably push it a little faster but I'm not sure if the additional velocity is worth the increased pressure (wear and tear on the rifle).....2350 to 2450 is comfortable to shoot....the additional power it takes to reach the 2500 to 2550 mark is pretty noticable in the BOOM factor....
The 20" rifle handled the 125's at 2600fps great.....I think the 1680 really shines in the 20" barrel.....it's funny, in the 16" barrel a charge of 22.5gr of 4227 and 25.8gr of 1680 produced almost identical fps (around 2440fps) ....but out of the 20" with the same loads the 1680 was over 100fps faster....no pressure signs with the 26gr of 1680 and still have a little room in the case.....
kurtz
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