This is a strange one. I am forming .25 Stevens centerfire from .22 Hornet brass..I try to use virgin brass, but I happened upon a stash of Winchester brass that had been used years ago, and fired multiple times with both jascketed and cast bullet loads. Most of the cast were fired with Hornady gas checks, but some plain-base loads were also fired. I always try to avoid any leading in bores, so loads were not high velocity..mostly 7.0gr. H4227 with a lead/steriotype metal alloy.
The Hornet brass is shortened to 1.125"..in examining the fired Win. brass, I noticed a coating of lead inside some case necks. A brush wouldn't remove the stuff..I had to check them up in lathe collet and use 400 wet or dry to remove...and even then it didn't all come out..it was like it was soldered on there. Yet I cannot recal ever having a bad case of bore leading in that rifle.
P.S.
I am getting forgetfull.....I just remembered these cases were annealed before forming. although I never noticed any lead buildup inside case mouths before..the fouling that was/is in there has a grayish color. Perhaps trace of lead either from friction or?? remained & was soldered to brass when heated.
Funny though I have never noticed this when annealing .40-70 brass..and this only has fired lead.
