Help with a Russian Berdan II Rifle

[browningautorifle]

Should the insert go almost all the way to the rifling?

Doesn't matter. It should come closer than farther, but you're going to get some splash and powder residue that will want scrubbing. I'd try to make it close to the leed as possible...still, if you loaded yourself, you can tailor it a bit...? But you don't, or don't want to start? Then you could use 44 mag casings and load way down. More common cartridge too, around here anyways.

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[MasterChief]

,444 Marlin? Longer case = longer chamber adapter.

[browningautorifle]

444 Marlin

Possibly...would be worth a look see.