Magtech brass 410 cases

Use of black powder will not cause corrosion. Failure to properly clean the firearm after the use of black powder will cause corrosion. Clean your gun after using black = no problem. Black powder not reccomended for the slothful among us.
 
What RCBS shellholder? And is loading data available? Would you use plastic wads in these?

there's basically no data and these are semi balloon head cases smokeless is not recommended their know to have families with too much BP(24ga for .577-450). if you are using these in a break action cleaning in not very hard with real black powder anyway just some hot water and a few patches.

black powder fowling is not corrosive its hygroscopic once cleaned it will not be a problem and its literally the easiest stuff to clean
 
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