Well as a follow up on this subject, I tested a couple bullet that I bought samples of and had very interesting results. Both bullets were shot using my R-15 223. This gun shoots 60grain VMax's with H332 well under MOA. I did a 7 shot warm up group that measured .778".
I shot 64gr and 70gr Bergers loaded to max mag length, 3 groups loaded with 3 different powder weights. I've never shot over 60 grain pills out of this gun so was excited to see results. I did a little research as to what these bullets generally like in an AR platform with a 9 twist. I did have an estimated 5-10mph tail wind so may have affected vertical results a bit ( I hope!)...
First 3 shot group of 64gr measured 1.68" , 1.050 horizontally
Second of 64gr measured 1.54" and 1.028" horizontally
First 3 shot group of 70gr measured 0.647" vertically and 0.175 horizontally
Second group of 70gr measured 0.630" vertically and 0.097 horizontally
I had 4 shots left of each bullet, but tail wind kept getting worse and I forgot to set up chrono... So I will wait for a nice calm day to finish.
So the sample route worked perfectly for me in this rifle and now I don't have 90 bullets of 64gr Bergers that would be of no use to me. I do have 3 other calibers that I have samples for though that may not show such obvious results...