My general findings and experience tells me....and anyone correct me....that supersonic (high pressure rounds) tend to benefit from more volume (which requires longer or fatter tube and/or fewer baffles) whereas subsonic rounds (low pressure) tend to benefit more from more baffles rather than more volume.....but idk what length bbl you're using on the 9.3Mauser, if you're using anything around a 20" bbl then I really don't think you need a 3" or 4" blast chamber...you should need only a 1.5".  otoh, if it has a 10" bbl on a 9.3Mauser, then maybe you'd need a 4" blast chamber so the can doesn't burst.  iow, I would keep the same total amount of spacer-length without making the blast chamber spacer super long if that is possible....spread out the spacer down the tube in between subsequent baffles.  

A really big blast chamber creates increased first round pop which is a big deal to me if I'm using it on a PDW...which you probably are not doing with a 9.3Mauser (this has to be a bolt gun w a long bbl). But if you're using it for hunting, then having a big first round pop totally defeats the purpose of the suppressor because how many times are you gonna have followup shots, really?

I think that with a 9.3Mauser you want to keep the extra 3oz and have the longer tube with more volume, but spread out the spacer more down the tube rather than having one big spacer for the blast chamber....my question is why would such lightweight be a big concern on a 9.3Mauser?  is it just rucking it in the field?

anyway just my 2 cents