While I am not personally familier with Sauer M8, if it is from pre WW2, with double underlugs and crossbolt, AND in excellent condition, I would see no problem with loads around 9K psi chamber pressure. IF this is typical Sauer 16X67 weighing 6,5 lbs or less, those 32 grams loads are going to whack you quite nicely.
I have and use a 6,2 lbs, totally original Sauer M2 hammer double in 16X67 and 1920s or teens DoM, also with same lockup, as well as tight bores and chokes, and stick with 28 or 24 gram loads -- 28 grams (1,0 oz) for hunting and 24 grams for targets. Where Pb shot is allowed for hunting, I stick with Remington Game Loads because they actually have 67 mm hulls (even though marked 70mm -- ditto for Fiocchi). For the few shots in actual hunting, I am not worried about the higher (10.500 psi +) Remington ammo in such a strongly built gun. Never needed heavier than 24 grams for trap or 28 grams for hunting shots to 40+ yards.
Actually, I only have one 16X67 that I ever used 32 grams factory loads in for hunting and that was because they were the only ones that gave really nice patterns for grouse hunting.
Niklas
