First off Congrats on the new AR

I have a 20in w/ a 1 in 9 twist I know yours is 16. But had to share my ar loves the IMR 4895 with nos 50gr bt. 25.6 grs with cci 450 primers and a oal of 2.260 it's almost perfect 3 @ a 100 inside a quater. Been out of that powder for about 8 months and just found 2lbs a little while ago. Didn't know what I was gonna do but all better now