I recently built my 300 Blackout. It is very accurate with jacketed 110 & 125 gr bullets at 100 yds. I have grouped 5 rounds that could be covered up by a quarter. I think you will be happy with performance. The question that I have would be using it with cast boolit. I only have one 30 cal mould. It is 311291. I tested 5 rounds a few weeks ago and couldn't get it to feed up the ramps properly plus didn't want to cycle either. So, I been looking for a mould that would work. I found a RCBS 7.62 x 130gr SPL. I was wondering if anybody has tried this boolit? I would buy a mould no problem but would like to try a few boolits out first.