Load Limit for 3" Repro

[Rud Blumentritt]

I would like some information on what are considered acceptable loads for a 20gauge Repro. Obviously there are some guns chambered for 2-3/4" and others chambered for 3" shells. Other than the barrel length and choke I can't tell a lot of difference. So my question is - what is the reasonable load limit in the 3" guns? Would any modern factory load be reasonable? If not, what would be considered the max load/velocity? My understanding is that the concern is not the chamber or barrel, but rather the stock being eventually damaged/broken. Thanks!