ORIGINAL: bigcountry
I have seen barrels that get better with age and shots upwards over 200 shots, and some that shoot like crap out of the box, and stays that way. I good indicator for me is how my velocities look. If I have Std dev. over 100fps, which is not uncommon for a brand new barrel, then its probably not there yet.
Only your gun and time will tell.
I was impressed with the std dev. They all stayed under 40, I had one load with 140grn Nos AB's the was about 8. The groups werent anything to brag about but the Std dev wasnt something I put much though into since they werent grouping real good.
I'm going to return to the drawing board and see what happens.