I know a bunch of you guys shoot aftermarket barrels, of you guys that shoot your sporter barrels a lot how many rounds do you get before your barrel just won't shoot. I was adding up my rounds down my 111 .270win in my data book and I am at 671 in the book. how many more rounds would you expect out of it before it starts losing accuracy and how bad have you seen it get. right now it's consistently shooting between .400 and .750" @ 100yards.