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Over on AR15.com I offered to compile a bunch of data concerning how 7.62x39 preforms in diffrent bbl lengths. I figured I'd share it with you guy's first. 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 hand loads 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 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 Stevens 200 were as follows 154grn Wolf 1.2" 123grn Monarch 1.37" 125grn Remington 1.0" __________________ ---------------------------------------- If you waste your time a talkin' to the people who don't listen To the things that you are sayin' who do you thinks gonna hear And if you should die explainin' how the thing they complain about Or the things they could be changing who do you thinks gonna care Waylon Jennings | ||
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One of Us |
Thanks for sharing. roger Old age is a high price to pay for maturity!!! Some never pay and some pay and never reap the reward. Wisdom comes with age! Sometimes age comes alone.. | |||
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One of Us |
Your AA 1680 25.5 grain loads and the Remington factory are a near exact match for my results over my Oehler 35P with the 16" Colt and like loads. Thanks for the post. Member NRA, SCI- Life #358 28+ years now! DRSS, double owner-shooter since 1983, O/U .30-06 Browning Continental set. | |||
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Yes, these are different barrel lengths, but they are also different barrels. In order to make an accurate comparison, you would have to start with the 26" barrel and cut it sequentially to the shorter lengths. However, your tests are at least a representative sample of the same ammunition(s) fired from barrels of various lengths. It does give us a useful idea of what the relationships might be. Thanks for posting this info! | |||
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One of Us |
I very much appreciate the posting of all your info. I have a pair of 7.62x39 uppers enroute here as we speak, and was curious as to what I might xpect from my DPMS and SGW uppers. Also very glad to get the 1680 data, as the brown truck just dropped off 1 M Hornady 123 gr. SP bulk bullets snd three magazines this afternoon, and I have a BUNCH of 1680 already on hand. OORAH!! Looks like fun comin' on board. My country gal's just a moonshiner's daughter, but I love her still. | |||
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