Will a 577 BPE (2 3/4" shell) fit into the action? I ask because I once had a large Greener martini action. With a barrel in place, it would not accept a 3" 577 shell. That is, the 577 shell was too long.

One option was to do a 577 Snider and the second option was to do a 577/500. Either one would be a fun gun.

Another option would be to buy a Greener shotgun action which is large enough for a 577 BPE.

I wound up selling the action, sights, etc to a friend after my gunsmith friend retired. I had planned on working with my gunsmith friend and using his equipment to build this rifle.