Hi All. First post here. I have a SMALL RING Sauer-Mauser in 7 x 57 that I am considering rebore and chamber to 9.3x64 Brenneke (Not 9.3 x 62) I have consulted with a reboring outfit and they tell me it can be done but would need some work on the feed ramp and opening of bolt face etc. Back story on this rifle is this: This is an early four digit s/n's Mauser 98 (Sauer Mauser) rebarreled to 7 x 57 in Germany in early 30's. (Originaly this Sauer-Mauser was likely 8 x 57J) Barrel has the intergral rib in (7 x 57) but the bore is crap. Barrel muzzle end measures .590 Dia. Question is can this 9.3 x 64 conversion be done safely on a small ring Mauser? Should I be concerned about strength of the small ring action with said conversion? Can anyone reccomend twist rates for this project? (Bullets up to 300 gr) Thank you in advance, Jeff