OAL that will fit an AR mag

[bythebook]

Does any one know what is the longest OAL that will work in an AR15 mag ? Thank you.

[Txhillbilly]

2.260" OAL is what most types of AR magazines will allow.

[bythebook]

Thanks Tx I am loading some 75 gr. Bergers for my Sons new AR and did not have it here. I loaded some at 2.260 as that is what the Berger book calls for, but half of the bullet is inside of the case. That really cuts into powder volume.

[devildogandboy]

ASC mags allow for a bit longer load. i think about 2.300-2.310. i use these for my Grendel and have loaded them out to 2.295 oal and there's still approx .020 left. this varies slightly between the mags.

Bruce