To me, the Bushmaster instructions seem a little vague. It says excessive cleaning during the 200 round break-in should be avoided. What does excessive mean? I thought I would want to remove melted in copper dust from the grooves of the barrel like I would do with a normal, non chrome lined barrel.
I generally spend a day at the range with a new Bushmaster and fire +/- 300 rounds. At the end of the day I swab the bore with Hoppes and let it sit. After about an hour I'll return to the bore and punch it again. Then I'll swab until the patches no longer emerge green.
A chrome lined barrel has to be "polished." That is why you shoot several hundred rounds through the barrel. If you clean with metal brushes during this time you tend to "scratch" the chrome and polishing takes longer.
It does not hurt to run a patch through the barrel to remove deposits during the break-in.
For all of my BM barrels before going to the range I lubricated the rifle well and ran a patch through the barrel with CLP then a couple of dry patches then shot up to three hundred rounds at one range visit. When I got home I cleaned the rifle, lubricated, and found that I only had to run patches through the barrel. No brushes were necessary.
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Originally Posted By Artifex: I used the "armalite" break in procedure (1 rd, clean X 10, 5 rds, clean X 10 10rds, clean X 5)
I used JB bore cleaner for cleanings.
So did I totally screw this barrel up or not?
No, you just used the proceedure that was invented by a barrel manufacturer (and quickly adopted by many others) designed to get people to wear out their barrels much more quickly then normal, which would require them to buy a new barrel sooner.
No less than the late Gale McMillan advises not to waste your time "breaking in" a barrel by overcleaning it or (especially) by using abrasives like bore paste.
Fortunately, your chromed Bushmaster barrel will take that abuse better than an unlined match barrel.
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Well, I would stick to the 223 diameter bullets myself but otherwise I would use whatever is cheap! Molly bullets will not have the same effect as you want the buller to buff the chrome lining. In addition, thr mollt bullets are not the cheapest bullets either!