i am pushing 2% sn wi th acww's to 1400 in my 24" model 92
with no leading problems, sized 452 with a fairly hard lube
i use this same lube in my 308 and a 4/6 mix with 20" bbl
have taken it to 2250.
usually the fit and pressure to hardness, takes care of leading issues.
mostly caused by too hard of a bullit