2 3/4” Chamber

[General Skanky]

What is the advantage of only having a 2 3/4” chamber when a lot of guns also have 3”?

 

[Jonny English]

You're supposed to get better performance when the cartridge matches your chamber size, how true that it is anyone's guess. So if you're only going to shoot clays 2 3/4 inch chamber and 70mm cartridges should create the best performance.