12-25-2011, 05:47 AM
I tried it once a long time ago on a new Remington PSS that looked like it had been rifled with a piece of gravel. It shot the same after as it did before. The bore looked like hell, but it always shot pretty well regardless. I even gave it 500 strokes of JB bore compound after that-- no change, same groups. Since then I don't break anything in. If I think of it, I pull a bore snake through a new tube before I shoot it the first time, but that is it.
I have learned to clean a bore after shooting Nosler bullets if I'm switching to Sierras or something else though. I was having inconsistent groups shooting my 19.5" Grendel with 120 Nosler BTs, 120 Sierras and 123 Lapuas. Bill A. pointed out that he had seen groups open up with other makers bullets after shooting Noslers, and recommended that I clean my bore after shooting the Noslers. Low and behold he was exactly right in my experience. Shoot Sierras-- good groups, shoot Noslers-- good groups, shoot Sierras after Noslers-- crappy groups. Clean bore-- Sierras shoot well again... weird! Something to do with jacket material I guess.
I have learned to clean a bore after shooting Nosler bullets if I'm switching to Sierras or something else though. I was having inconsistent groups shooting my 19.5" Grendel with 120 Nosler BTs, 120 Sierras and 123 Lapuas. Bill A. pointed out that he had seen groups open up with other makers bullets after shooting Noslers, and recommended that I clean my bore after shooting the Noslers. Low and behold he was exactly right in my experience. Shoot Sierras-- good groups, shoot Noslers-- good groups, shoot Sierras after Noslers-- crappy groups. Clean bore-- Sierras shoot well again... weird! Something to do with jacket material I guess.