Originally Posted by Michael Eichele
1: It is near impossible to improve the bore of a quality custom barrel when new.
2: It is almost always possible to improve factory bores.
I wholeheartedly agree with that. I was fortunate to get a tour of the Shilen factory when I bought my last custom barrel. I brought in a factory Model 700 in 7mm Rem Mag for re-barrleing. One of the smiths gave me a look at the bore with one of their high power, high dollar borescope machines. The bore looked like it had been cut with a rusty nail! The tool marks where hideous and deep.
The next bore we "scoped" was a Shilen Select Match Grade barrel that had been hand lapped. It was as smooth as glass. No tool marks visible at all. If I had not been sold already, I just was.
I have 2 Kriegers, and one Shilen. I broke all three in exactly like the manufactures recommend. I was easy and they all shoot very very well.
There is a guy at my range who broke in one of his Hart barrels with the Tubb Final Finish. So far so good according to him. Here is a video interview with barrel maker John Krieger. He talks a a little about maintenance and cleaning near the end.