If its a factory barrel it can take a noticably longer time to break in then a fine match barrel.
For match barrels, the method I recommend to customers is to load up or get 25 rounds of ammo. Take 10 of those rounds, shot and clean between each shot. After the bore is completely clean, lube with a quality bore oil and push out excess with dry cotton patch, fire again and repeat. The oil in the bore really seems to speed up barrel break in. Think of it as machining with cutting fluid as apposed to no lube, does not work well without some lube between the cutter and work piece. Same thing with barrel break in.
When your finished with this, take the last 15 rounds, shoot three and clean, lube and shoot again for a total of 5 three shot groups.
Once your done with this, I have not seen a match grade barrel that was not fully broken in.
I have seen some factory barrels that took 100 rounds before they really broke in well so it just depends on the barrels bore quality. IF its a really rough barrel, something like "Final Finish" can help with break in as well but I only recommend that on very rough barrels.
