well I have had a few 14 twist 6BR's..have two right now..most of my 24" or 26" barrels would shoot 30.5 gr RL10x behind any good 65-66gr custom bullet,lit by a cci 450 primer.. most of the time .010 off the rifeling shot the best..I do mean ppc accurate..mid .100's to mid .200's.. and fairley consistantly over a huge temp range..But i have a 21 3/4 " 13.75 twist barrel now that just does not seem to like it all. But i can say. a shelin,a pac nor(3 groove), a brux. all shot that load real well..If you are shooting a 8 twist I dont know what to tell you, but if it's a 12 twist I would say back off the powder.. find something in the 30.5 to 31.5 range. H322 has shot real well, H4895 has shot well, N133 has shot well,N135,IMR8208xbr,,just to name a few. But dont push it like you would a varmint load. keep the powder down, filled to the top of the shoulder is good enough.That load has shot well enough that i have a hard time not taking it to a match, I know how bad my last agg was with my ppc.I been thinking all week of shooting my 6BR in the next one. ah but i just cant have to take the 6ppc..I know it will be a search in the morning to try and find what will shoot well with either rifle,and im getting real close to knowing what my 6ppc will want..plus i have shot a few small group with it and want to shoot some more of them..