My guns(Baker's) have 2 5/8" chambers. I cut the hull down to 2 5/8" and reload with a modern reloader (Mec Jr. and a Mec Grabber) that uses the star crimp. The thing you need to do, is close the "hole" in the center of the star crimp, since you have now cut the hull shorter. To do that, just install and over shot card, before crimping and the hole is closed. This type of over shot card and crimp is called a Hartin crimp.
There has been discussions before about shooting 2 3/4" shells in a 2 5/8" chamber. I wish I could remember who did the testing, but maybe a search would find it for you. Anyhow, the rise in pressure was pretty minor and it appeared to not be a problem. But, I still cut my hulls and reload them at 2 5/8" so that way I KNOW they are low pressure and a high pressure didn't get slipped in somehow.
I currently have 1000's loaded and always looking for an excuse to shoot them.
