Trigger Mike Posted December 1, 2020 Share Posted December 1, 2020 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. Link to comment Share on other sites More sharing options...
Marshal Hangtree 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. Link to comment Share on other sites More sharing options...
Pat Riot 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. Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted December 1, 2020 Share Posted December 1, 2020 Confirm your ROT before using anything heavier than 150-155gn. Link to comment Share on other sites More sharing options...
Trigger Mike 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 Link to comment Share on other sites More sharing options...
Charlie Harley, #14153 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. Link to comment Share on other sites More sharing options...
Irish Pat Posted December 1, 2020 Share Posted December 1, 2020 165 as I hunt with 165 Nosler green tip. Always just one shot Link to comment Share on other sites More sharing options...
Arkansas Jim 107095 Posted December 1, 2020 Share Posted December 1, 2020 My M1a has 1:11 RH twist Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz 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 Link to comment Share on other sites More sharing options...
Trigger Mike 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? Link to comment Share on other sites More sharing options...
The Original Lumpy Gritz Posted December 1, 2020 Share Posted December 1, 2020 Ck out the M14 forum OLG Link to comment Share on other sites More sharing options...
Pat Riot 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. Link to comment Share on other sites More sharing options...
watab kid 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 Link to comment Share on other sites More sharing options...
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