Do some searches, GoodGrouper and UncleB do the Tubbs thing to every factory rifle they start with (I think) after hearing their results and accepting a little counsel for them I did the FF on a new unfired 338 RUM barrel.
I followed the FF procedure, then did the break in.
I'd give the process very high marks.
I may be the slowest guy on the mountain . . . . but . . . . I'm on the mountain!
Though I don't have the experience, I've got to second Catshooter on this one. Why not "fire lap" the barrel by shooting.... real ammo down it? You could smooth it out in 20 shots with the abrasives, or you could smooth it out after 200 rounds of real shooting... either way you are taking 200 rounds of barrel life away......
~Pray to God...but swim toward shore~
Barrel life comes down to heat exposure, not wear. Why do you think it's better to break in with MORE shooting?
I use FF even on custom barrels for break in, with no movement of the lands. 10rnds stabilizes things, and a followup with a single FF round every 50 or so(just to dress up the lands). There is also the possibility of lapping in a slight taper, which is good for accuracy.
I've never seen a barrel shoot worse, or lose life due to FF use. Usually barrels shoot better after treatment.
Well I guess I will way in on this. Some good info and some out in left field.
Firelapping is not normally done for "break in" in the first place.
Each mftr of a custom barrel has different guidelines for breakin. Some say do it and some say do not worry.
Firelapping does not score the rifling, it polishes (ie thru the use of progressive finer grits) it by removing high spots and tool marks. that is like saying we finish the wood on a stock "scoring" it by using progressively finer grit sandpaper. Terrible sounding and totally inaccurate.
What do you think custom barrel makers use when "lapping' their barrels? Answer is abrasive grits.
I strongly agree/disgree with the statement not to firelap.
1. Agree to never ever firelap a CUSTOM barrel.
2. Disagree with not firelapping factory barrels. On factory barrels if you have bad coppering, I use only 5 bullets (instructions call for 10 of each grit) of the heavier grit to avoid pushing the throat too much and same even on the finer grits.
The last time I firelapped a factory barrel, my throat moved .010 only and it sure helped accuracy and cleaning. It would take hundreds of rounds down a barrel to remove the factory tool marks which would kill the throat first. So firelapping properly and sparingly done on a factory barrel is worth considering.
I have an Adams and Bennett .308 barrel on a Yugo Mauser. So far it has 100 rounds through it. When it is squeaky clean, it shoots 1 hole 5 shot groups at 100 yards. However, it fouls badly and quickly. After 5 shots the bore looks like a shiny penny. Only an overnight soak with Wipeout will remove the fouling and restore accuracy. Needless to say, I would like to shoot more than 5 shots when I go to the range. What do all you guys think, should I use Final Finish to remedy the fouling situation and, if so, how many rounds should I use as this barrel is neither a "factory" or a high end, lapped at the factory barrel?