Trigger Mike 1,041 Posted December 1, 2020 Share Posted December 1, 2020 (edited) If you could only buy 1 box of ammo.to zero your m1a with , would you buy PMC 165 grn 308 , 155 grn colt match ammo in 308 or 7.62x51 all 3 being FMJ of a differentbrand? I have good hunting rounds for afterwards. Edited December 1, 2020 by Trigger Mike Quote Link to post Share on other sites
Marshal Hangtree 2,128 Posted December 1, 2020 Share Posted December 1, 2020 I'd say, zero the rifle with the same rounds you'll hunt with, Trigger Mike. 5 Quote Link to post Share on other sites
Pat Riot, SASS #13748 22,831 Posted December 1, 2020 Share Posted December 1, 2020 I would buy the ammo that closely matches the weight and FPS of the good hunting ammo. Quote Link to post Share on other sites
The Original Lumpy Gritz 7,380 Posted December 1, 2020 Share Posted December 1, 2020 Confirm your ROT before using anything heavier than 150-155gn. Quote Link to post Share on other sites
Trigger Mike 1,041 Posted December 1, 2020 Author Share Posted December 1, 2020 28 minutes ago, The Original Lumpy Gritz said: Confirm your ROT before using anything heavier than 150-155gn. I'm new to the rifle. Please provide more detail Quote Link to post Share on other sites
Charlie Harley, #14153 2,999 Posted December 1, 2020 Share Posted December 1, 2020 Use whatever cheap ammo is closest in bullet weight to your hunting ammo. 9 minutes ago, Trigger Mike said: I’m new to the rifle. Please provide more detail Heavier bullets require faster rates of twist (ROT) in the barrel’s rifling to stabilize the heavier/longer projectiles. Grits can provide details of what’s needed in the 7.62 selection of bullets. Quote Link to post Share on other sites
Irish-Pat 357 Posted December 1, 2020 Share Posted December 1, 2020 165 as I hunt with 165 Nosler green tip. Always just one shot Quote Link to post Share on other sites
Arkansas Jim 107095 72 Posted December 1, 2020 Share Posted December 1, 2020 My M1a has 1:11 RH twist Quote Link to post Share on other sites
The Original Lumpy Gritz 7,380 Posted December 1, 2020 Share Posted December 1, 2020 1 hour ago, Trigger Mike said: I'm new to the rifle. Please provide more detail Heavier the bullet, faster the ROT should be. Also, the rifle's gas porting is set up for mil-spec 7.62 ammo. The heavier bullets may start beating the op-rod. OLG Quote Link to post Share on other sites
Trigger Mike 1,041 Posted December 1, 2020 Author Share Posted December 1, 2020 Sorta like how the garand can not handle most commercial hunting rounds due to the oprod. So u might would be better off with the 7.62 x 51 ammo then ? Use hunting ammo in 308 sparingly unless down around 150 grain? Quote Link to post Share on other sites
The Original Lumpy Gritz 7,380 Posted December 1, 2020 Share Posted December 1, 2020 Ck out the M14 forum OLG Quote Link to post Share on other sites
Pat Riot, SASS #13748 22,831 Posted December 2, 2020 Share Posted December 2, 2020 My friend has an M1A he’s been shooting for 25 years with NATO 147 grain ammo and commercial .308 with 150 grain bullets. I do the same in my M1 Garand that I converted to .308 years ago. A 150 grain hunting load will take cate of anything you encounter where you live. If it doesn’t you’re doing something wrong. 1 1 Quote Link to post Share on other sites
watab kid 1,078 Posted December 2, 2020 Share Posted December 2, 2020 always sight in with what you will be shooting or your POI will not match the sighted POA , make sure what you buy all came from the same lot Quote Link to post Share on other sites
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