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9/19/2017 7:27:10 PM
Posted: 5/12/2001 3:38:57 PM EDT
I need help to settle an arguement. What are the best twists for 55, 62 and 77 gr. bullets. Also what did the first AR's have for a rate. I know that 1:8 is favored for 600yd. comp. But my friend has a 1:7 colt sporter that shoots tight 55gr. groups, but spreads 62Gr. all over. He says fast twists for light bullets, another has 1:7 twist and it tears 55gr. apart. I say fast twists for heavier ones. PLEASE HELP!!!
Link Posted: 5/12/2001 3:45:03 PM EDT
Faster twists are for heavier bullets. The old 1 in 12 twist of the M16A1 will not stabilize anything over 55 grains very well. 1 in 9 will do up to 75 grains well, in my experience. Haven't had any trouble with 1 in 7 tearing light bullets apart, but I've heard of it happening. I believe the first M16's were 1 in 14, which resulted in spectacular bullet de-stabilization in soft targets, but that twist would not stabilize the bullet enough to meet minimum military accuracy standards in arctic conditions. Many varmint shooters use a 1 in 13 twist because they are shooting 40-52 grain bullets. The match shooters who are using 80-grain VLD bullets almost uniformly use a 1 in 8 twist.
Link Posted: 5/12/2001 6:12:01 PM EDT
stronghorn: dito sparky
Link Posted: 5/12/2001 7:21:26 PM EDT
THANKS VERY MUCH GUYS. But the other guy will be to stubborn to agree.
Link Posted: 5/12/2001 9:58:45 PM EDT
Link Posted: 5/12/2001 10:05:51 PM EDT
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