My pistol is a new S&W M&P 9. I have fired 50 or so of my COWW cast boolets and have gotten it to foul less than when I began, after joining here and doing a lot of reading.. I haven't worked up a load yet but most rounds have been fired with 3.8 and 3.9 of RedDot with 105 358 SWC with BAC lube. I made a .3575 expander for my .358 sized boolets and they are not being sized down when seating.
I cleaned it good yesterday and thought I would try some FMJ's in it this morning. I put up a target in the back yard and fired off 50 rounds. I really like the way this Smith shoots and feels while shooting.
One patch down the barrel to get some of the carbon out (I use Mercury Quicksilver Power Tune, its made to clean carbon out of outboard motors) and my goodness, this thing is copper streaked from top to bottom. I am using the same method I do with my prairie dog rifles, which is soaking in Sweets and scrubbing with JB compound. I will finish with Flitz. Its gonna take a lot of patches..
Thanks for letting me ramble....