Originally Posted By: Siringo
I haven't, but I ruined brass in the beginning by loading too hot. Once I got the load down, it didn't matter much.

What is "coning"?

What brand of brass are you using?

Sorry, I meant coining, like having the ejector or some part of the bolt punch a shape in the back of the brass. I saw it on even the loads I made on the low end of the ladder. I loaded up a ladder of 90gr SGK's using H335 and TAC and it happened on both powders which made me wonder if it was because the brass wasn't fire formed yet.

Sierra GK's
COAL 2.19
TAC 28.5gr- 31g
H335 27.9-30.4g
Loaded in new SSA brass