Well if a guy really wants the definitive blow by blow on what was corrosive I suggest you get a copy of Hatchers Notebook. Over the last 40 years I've sure had relatively little problem with SL 43 brass,TW stamped and of course LC. You wanna get down to cases and brass tacks( or hulls in this case) The cartridge cases that have given me the most problems were stamped Herters from the 50's to 60's. GI brass is consistant and heavy compared to commercial. I enjoy using it in 223, 308, 30-06, 9mm,38 spcl , and 45 acp. MB
