The other day I loaded up some converted 8mm lebel and shot the 41 swiss vertilli. I had converted it to centerfire awhile back

I picked up a mold and a lee bullet sizing die in .427. I slugged the bore on the swiss and it measures .421. There is little loading data on this round. It is recommended to use trapdoor springfield data for the 45-70. I chose 25 grains IMR 4198 and a 320 grain bullet. I get a bit of blowback on the brass. I was surprised of this and am using close to pure lead or close.

I also shot some of the bullets as cast, they measure .433. I would like to find a hollow base mold for the swiss.

anyhoo getting a bit closer

here's a link with a link