Here's the data I offered to compile  concerning how 7.62x39 preforms in diffrent bbl lengths for the new 7.62x39mm FAQ


The rifles used for this test differed greatly from one another so please don't take this as "one size fits all" data.

The rifles used were as follows

1. A norinco 16.5" paratrooper SKS .310bore

2. is a 20" Model 1 Sales AR15 upper .310bore

3. a custom bolt gun with a 1/15 inch twist bbl that's 26" long and has a .308 bore

All chrony readings were taken at 12 feet with a model F1 without sky screens against a uniformly Grey overcast sky and an air temp of 55 degrees. Perfect chronographing weather.

Part 1 factory loads

154 grain WOLF sp


16' bbl........20" bbl........ 26" bbl
2042............2106............2273
2025............2110............2265
2015............2113............2261
2041............2125............2256
2033............2124............2250

avg velocity
2031............2115............2261



123 grn Monarch FMJ

16' bbl........20" bbl........ 26" bbl
2354............2432............2599
2345............2418............2595
2377............2405............2593
2315............2453............2548
2330............2422............2601

avg velocity
2344............2426............2587


125 grn Remington SP

16' bbl........20" bbl........ 26" bbl
2265............2261............2428
2238............2308............2444
2202............2304............2437
2191............2366............2485
2224............2264............2486

avg velocity
2224............2300............2456


Part 2 [b]hand loads[/B

for these loads the 26" rifle was omitted and the SKS had the gas piston removed due to slamfire and cycling concerns

170grn Sierra .308 diameter 30-30 flat point, magtech SR primer, 28.0grs H335

16' bbl........20" bbl

1921............1968
1924............1967
1931............1970
1936............1970
1896............1985

avg velocity
1921............1972

125 grn nosler b-tip, magtech SR primer, 25.5grs AA1680

16' bbl........20" bbl

2256............2359
2226............2355
2243............2361


avg velocity
2241............2358


The only real loser in all this is the anemic Remington ammo, this stuff just reinforces my assertion that anything European and METRIC factory loaded in this country is going to suck.

The most interesting find was just how fast and accurate these loads were when fired from as accurate platform as possible through a 26" tube

5 shot groups for the factory loads in the 26" bolt gun were as follows
154grn Wolf 1.2"
123grn Monarch 1.37"
125grn Remington 1.0"

very good info, does anyone have any data for a short barrel say 10.5 inch?

Thanks
Paul

Thanks very much for your efforts and information.  

ArticWolf

According to my point blank program the ballistic numbers are as follows


154 grain Wolf SP, ballistic coefficient .3302

range........elevation........velocity........energy

16.5" bbl

100yds........+4.64"........1813fps........1124 fpe
200yds........+0.00"........1614fps........890 fpe
300yds........-17.78".......1432fps........701 fpe


20" bbl

100yds........+4.20"........1891fps........1223 fpe
200yds........+0.00"........1685fps........971 fpe
300yds........-16.39".......1497fps........766 fpe


26" bbl

100yds........+3.46"........2029fps........1407 fpe
200yds........+0.00"........1811fps........1121 fpe
300yds........-14.35".......1612fps........888 fpe



123 grain Monarch FMJ, ballistic coefficient .257?

range........elevation........velocity........energy

16.5" bbl

100yds........+3.44"........2042fps........1139 fpe
200yds........+0.00"........1765fps........850 fpe
300yds........-14.72".......1517fps........628 fpe


20" bbl

100yds........+3.12"........2118fps........1225 fpe
200yds........+0.00"........1833fps........918 fpe
300yds........-13.74".......1578fps........680 fpe


26" bbl

100yds........+2.66"........2268fps........1404 fpe
200yds........+0.00"........1971fps........1061 fpe
300yds........-11.71".......1701fps........790 fpe


125 grain Remington SP, ballistic coefficient .267

range........elevation........velocity........energy

16.5" bbl

100yds........+3,93"........1941fps........1046 fpe
200yds........+0.00"........1684fps........787 fpe
300yds........-16.15".......1454fps........587 fpe


20" bbl

100yds........+3.57"........2012fps........1124 fpe
200yds........+0.00"........1747fps........847 fpe
300yds........-15.02".......1510fps........633 fpe


26" bbl

100yds........+2.97"........2157fps........1292 fpe
200yds........+0.00"........1879fps........980 fpe
300yds........-13.11".......1629fps........736 fpe

wolf 123 grains runs 2350 - 2400 fps in my Ruger m77 bolt gun I think it has a  22" barrel. sorry it in the back of the safe

Any idea of the twist rate on those barrels?

I believe that both the SKS and model 1 barrel run appx 1/9 inches, please correct me if I'm wrong

Cool, just checking, I have been curious about how the twist rate effects common 7.62x39 ammo performance.  Mainly because my pre ban colt sporter w/ 16in barrel has a 1 in 12 twist.