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I go by the shoot and clean method. By how rough the patches go through some barrels with a lot of crap the first few shots. It seems to improve fairly quickly but sometimes needs more before the groups tighten up.
I see absolutely no harm in it. This is a way to sight in while getting familiar.
+1 The "seasoning" Pac-Nor recomends takes40runds and a couple of hours. That's not that big of a deal in my book.
Unless you'r shooting some crazy-fast wildcat that only gets 600 or so rounds out of a barrel,40 rounds is pretty incidental IMO.
It's all speculation any way since no two barrels are the exact same, and it's impossible to do any comparison on one barrel.
VarmintAl has some interesting theories on his web-site reguarding break-in. He advocates the use of JB Paste to do the same work as the bullete for smoothing out tool marks and imperfections.
I have a new 22/250 SPS that I used his prescribed method on, but haven't shot yet. I'll still shoot-n-clean a little bit and see if it starts to clean up a little faster. /ubbthreads/images/graemlins/confused1.gif Still nothing to compare it to, so who knows????
One thing that is 100% undeniable though, is that no amount of scrubbing with magic elixors or any other Voo-Doo will make a bad barrel into a good one.
Like I said before, "read all of the variuos theories and make your own decision".