So I read the Frenchicon 11mm was close to 45 caliber so I tried putting a 45acp in it and it didn't fit. But I had a 45-70 handy and it did fit in all the way up to the shoulder area.

I'm almost a complete novice when it comes to reloading so my question would be can I cut down the 45-70 cases to fit in the chamber using the case mouth to headspace and fire light loads out of this? Probably a little more complex than that but just investigating right now.