I tried the break-in cleaning drill once on a stainless barrel. It didn't seem to make much difference. It shoots just like similar barrels I own without the break-in. And I don't/wouldn't break in CL barrels. After all, hasn't the machining (or hammering in a HF barrel) been covered by chrome? All my steel barrels are hammer forged and chrome lined. What's the likely hood a copper bullet jacket is going to alter chromed steel?
Some barrels just seem to shoot a little better than others too. I've got a BCM 14.5" BFH light weight barrel that is just amazing and spits out CBC 77gr pills into sub-MOA 5+ shot holes using a very old Trijicon 1.25-4X Accupoint. I am afraid to mess with it at all. I think I've cleaned it twice, but I don't shoot it that often either.
I've also got three identical Noveske 16" HF CL barrels. Each shoots slightly differently. I haven't tried to wring maximum accuracy out of all my barrels, but I have a general idea of their capability.
My BCM 410 16" shoots very well for a button rifled stainless barrel, but not as well as the 14.5" BFH I mentioned above. Go figure.
Lastly, the ammo you use has as much to do with how your rifle will perform as any other component. I don't have time to reload, but I always test 'relative' accuracy with a 77gr match pill. Although a 1:8 twist might shoot better with a 69gr. I'm not really that interested in target accuracy anyway, I just like to know how well a barrel can shoot.
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