By clean I mean to the extent that some ppl will keep cleaning until the copper is removed. Otherwise for an excessively cleaned, lubed barrel that sounds strange to me and just cause some ppl generally accept it doenst make it correct. I mean lots of ppl believe in God despite there being absolutely no evidence of his existence, that is faith and not science. Like I said I'd like to see some evidence via repeatable scientific experiment yet strangely I see none. So the relationship of clean to lower pressure by itself, well I see no logical link. There is however some academic discussion that at extreme velocities and low loads the copper turns liquid greatly reducing friction and hence the velocity is higher. For the first shot of a too clean barrel there is no copper film for this effect to occur, hence the fractional MOA drop.
In terms of "cleaned" sure. Carbon would seem to be a clear fouling issue after so many rounds, so cleaning off the carbon and hence the restoration of accuracy can be demonstrated I have no particular issue with that. "300 rounds" and then we see we have a not clean[ed] enough of carbon bore, maybe.
I guess Im not happy that I am basing actions on solid ground but guess work that may not be correct, bad idea IMHO.
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