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M40 barrel twist

Ted Harte

Private
Minuteman
Sep 2, 2020
15
8
Looking to build up a M40 Clone, and would like to use it for longer ranges 500 plus.
.308 of course, 24 " but what twist rate ?
1/10 or 1/12 ?
 
Looking to build up a M40 Clone, and would like to use it for longer ranges 500 plus.
.308 of course, 24 " but what twist rate ?
1/10 or 1/12 ?
Depends.
Original M40 from remington had a 1-10 twist, once they began to transition to M40A1 they changed to 1-12.
Either is sufficient to stabilize the 175 class of bullets.
 
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I'm guessing with handloads either will shoot fine.
Any known reason to change to 1/12 with the a1 ?
 
My clone is 1/12, buts that due to the factory sps varmint action/barrel. Haven’t shot at 500, but it does work at 2.
 

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