OK. Now you have a modern steel american shotgun. Let's say a 1960 Mod. 12 trap gun that's chambered for 2 3/4". I think all would agree you can safely shoot modern 2 3/4" and even the hot 2 3/4" magnums in it.
How about shooting 3" modern shells in same? Is that OK?
Isn't that the same situation as shooting 2 3/4" shells in short chambers? Sure the older double guns were designed for lower pressures. But as a few of you think that's not a problem if lower pressure 2 3/4" shells are used in older short chambered double guns.
