Re: +/- on measuring.
Read up about, and find your OCW load,
I have just finished working up a great round for my friends AR-15
1-8" twist, with 77gr bergers.
I chose 23.8 gr varget, because when I loaded a 23.6, 23.8 and a 24.0 charge,
All 3 shots clover-leaf at 100yrds.
I went on to...