Actually, shooting two boxes of conicals (20X2) would be good medicine to get that pitting burr smoothed out. Buy some full-bore Maxiballs or Buffalo Ballets. Try your sabots afterwards & maybe your petal breaks will cease & your accuracy will improve. Heck, I'd even leave some JB Bore Paste in the bore with both of those boxes. I think they call that fire-lapping. With lube already on the Maxiballs to mix-in with JBs, it should smooth it out. Let us know how it all works out.