Black hole weaponry

[Rainman]

I have a 1:9" twist fluted midweight 18" BHW that is very accurate with 123s and lighter weight bullets. Moving up to 129/130 grainers opens groups up to just under 1 MOA for 5 shots @100 yards. If you want one all around rifle I'd go with the 1:8" twist. I just ordered a new Alexander Arms 16" Light Weight upper that has a 1:7.5" twist so between the two uppers I should be able to handle all bullet weights suitable for 6.5 Grendel.