Originally Posted By: John Roberts
It's actually about a 3 1/2" to 4" disparity in length between a semi-auto and an o/u or sxs, in general. But your point is a good one.
JR


And that is gauge and chamber length dependent. It can be shorter for 28 and 16 gauges which don't have modern ammo longer than 2 3/4" although 28 ga is expanding to 3" shells.