As a update on my 1/8 twist barrel I loaded up some 65 gr varmint bullets. I varied the charge from min to max, going up .5 gr at a time. HORRIBLE GROUPS, worse than anything else I tried. I'm at my wits end trying to make that thing shoot at good group, (less that 2" @ 100 YDS. Options now include a trip to the band saw, install it in a hyd bender or light the cutting torch.