8 years ago I did the barrel break in on a Rem. 700 LTR 308 Cal. was always very accurate. Had the barrel replaced & action blueprinted, Rock Creek did not recommend a barrel break in, they just said shoot 20 slow fired rounds and your done. Thats what I did, am very pleased. The production barrels do foul more than a custom, I feel if the barrel is accurate breaking in will not change it to be better, same goes for a bad barrel. Luck of the draw. Most barrels shoot good.