![]() The M1A handles all the military ammo (especially M80) very well. 1:10 twist is very good for 7.62/.308 diameter bullets in general and can handle weights up to 190g (I also have a 1:10 Deadshot 18" barrel for my SCAR 17) and bullet lengths up to 1.425" (I haven't tried anything heavier or longer in the 1:10 barrel yet) are fully stable at the 1:10 twist. M62 tracer on the other hand is 1.330" long, which certainly accounts for the reduced accuracy I get with tracers. M80 Ball projectiles are usually about 1.122"-1.24" long. Longer bullets than that just won't stabilize properly in my 1:12 barrel. It is great for bullets up to 175g (SMK & Berger), but accuracy really suffers if the bullet (the projectile, not the whole cartridge) is longer than 1.263" (the 175g Bergers are 1.268"). ![]() The SCAR has a 1:12 twist and usually produces sub-moa with M80 ball, and 3 moa with the M62 tracers. Well, I had an M1A at the time that I came into a supply of 4,000 rounds of M80 Ball and M62 Tracer (all in belts 4 & 1).
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