J.P. Sauer and loads

[Coppershot]

I came into three J.P Sauer side by sides (12 ga.), Greener crossbolts and all, marked 1950, 1961, 1962. The bores are excellent and they lock up tight with or without the forearm. Overall condition appears 96% or better on all three. Should I have any concern shooting modern high brass (non magnum) loads in these guns? One is Full / Full, the others are I/C-I/M or Light modified. They are marked 70 / 70 which I take to be 2 3/4 inch chambers.

Thanks.

 

[mapsjanhere]

No