Model 37's can be very particular about the ammo fed to them. It's unusual, though, to suddenly run into this problem if you haven't made an ammunition switch.
There are a number of potential culprits, most of which have been mentioned: high brass in tight chambers, binding forend metal, etc.

A man who can surely solve any and all problems is Les at Diamond Gunsmithing (mentioned in the first response). He was imployed by Ithaca and was their main gunsmith for many years and knows these guns intimately.

These are great guns and it should be a simple fix. I shoot a lot of sporting clays and skeet with my four Ithaca 37's. I have experienced extraction and feeding problems (generally with reloads) and have had Les solve them all when he was with Ithaca.

Last edited by Tom28ga; 06/10/07 09:24 PM.