Re: When to clean the bore
http://www.6mmbr.com/borebrushing.html
...all this shows is that there appears to be no absolute rule...AND all are champions or industry professionals.
If all the professionals seem to have their own cleaning routine and can't agree on ONE method....AND they all win and are recognized as champions or experts in the field. My conclusion is that it doesn't really matter as long as whatever method your decide on is based/grounded in common sense.
I personally clean very well after every time I shoot and my 6.5 Creedmoor HAMMERS at 1k if I'm not killed by the coastal California wind.
If you notice that you shoot better with a dirty bore don't clean as much...if you like to have a clean gun...clean more. Like I said, I clean often and if I do my part the rifle hammers. You can treat your rifle like a Marine sniper that is 7 months into a 9 month deployment...but if you don't have to; why on earth would you. You either have already or will pay good money in the future for your gear...pamper it, until for some reason you can't (i.e. competition, extended hunting trip etc...)
Also, for me personnaly...a boresnake would NEVER touch my bore unless I was actually 7 months into a 9 month deployment and I was in middle of sending some folks to meet up with their virgins.
Gary Schneider, Schneider Rifle Barrels (primary barrel used on USMC Sniper rifles)
"I'm a proponent of keeping your barrel clean, and cleaning whenever practical. A disciplined benchrest shooter will clean often. But every shooting discipline has a different shot cycle that will dictate how many shots can be fired before it's practical to clean."