RFI .410 question

[Beerhunter]

The chamber will accept a fired 3" shell, so it seems that is has been opened up to fire 3".

Does anyone have any suggestions about this? I would appreciate any help. Thanks in advance.

Try 2.5 inch cartridges.

However, even if they fire, I have found that due to the bulging of a .410 shotgun cartridge's rim after firing, Ishapore muskets will often fail to extract the fired cartridge from the breech.

I thought the cases for those guns were built from opened up 303 brass. That would explain the rim thing.

Nope. The cartridges were made from un-necked .303 brass. (As opposed to "opened up".)

Lo and behold, the old .410's brother showed up to roost at my place. This new one is chambered to fire the original .303 casings. The fellow sent along a bunch of felt wad cards, plastic wads, plus a supply of lead balls. My buddy and I will have some fun shooting these old fellers!

You will need to fire-form some empty .303 brass, because they will have been necked down for use in .303 rifle chambers.