I am going by a thread I read years ago regarding this, helped me out a BUNCH, from those more knowledgeable than I was when first introduced to the last rifle I will ever own:
Springfield Armory Recommended ammo for our rifles chambered in .308
Any commercially produced, new in box .308 ammunition that meets the following requirements:
• Is a 147 to 180 grain bullet
• Is full metal jacket (FMJ), hollow point (HP or BTHP), or ballistic tip type bullet.
• Hornady’s new superformance ammo is OK to shoot in the M1A but NOT recommended for the M1 Garand.
• Hornady tap ammo is better for the shorter barreled rifles.
• Black Hills re-manufactured ammo is ok to use.
You can also use SURPLUS 7.62X51 NATO ammo that meets the following requirements:
• Is clean and from sealed containers
• Is NATO spec. It will have a NATO spec mark on the case head and /or on the packaging that looks like a plus sign inside of a circle.
Ammunition NOT recommended for your rifle:
• Avoid using surplus ammo tha tis “loose” or “bulk” – is is inconsitant in size and can be reloads.
• Avoid using steel case ammo, it is VERY hard on your chamber and can reduce the life span of your rifle.
• Do not use “ light Magnum” type ammo. • Do not use soft point (SP) ammo, the lead shavings can get into the action and jam it up. - (I SCRUB my rifle after hunting, and only utilize maybe 2-3 bullets a year to tag out, I seriously doubt this will cause much of a build-up)
• We do not recommend the use of any cast bullets.
For best accuracy we recommend:
• Federal Match or Black Hills match 168 or 175 grain
• Hornady Match/ custom 168 grain or Hornady TAP 110 or 168 grain.
Please visit web site: http://en.wikipedia.org/wiki/.308_Winchester
for further comparison between .308 and 7.62 ammo.
Thank you for choosing Springfield Armory.
Have a nice day!
800-680-6866 Winchester Super X 150 grain power point with M1A