Jeff;
I have a hammer drilling with the rifle bbl in 9.3x72R by "Miller & Val Greiss, München". Proof date is 6,13.
Caliber marking (Proof House) is 8.8m/m over 72. It carries a Crown/N followed by K.m.G/12.7gr. This indicates a bore dia of about .3465" or .0175" smaller than the normal .364" bullet dia of the 9.3x72R & a smokeless proof for a Copper Jacketed Bullet of 12.7 grams (196 grains). Prior to 1912 "most" 9.3x72R's will not carry the smokeless proof & may be proofed for a lead bullet (Bl.G). Also early guns can carry a "Gauge" marking for the rifle & depending upon exact bore dia may be either 108,5 (.350") or 118,35 (.340"). These were measured with plug gauges which were in .010" increments. Thus if the bore accepted the .350" plug it would have been marked 108,5, if not but did accept the .340" one then a 118,35. Some variations will occur, but this is the only one I have to give actual markings. The 9.3x72R originated for use with lead bullets & when offered in a jacketed bullet version the jackets were rather thin & soft, thus deep rifling seems to have been maintained, at least for some amount of time.
Hope this is of some help to you.
Last edited by 2-piper; 09/06/08 08:57 AM.
