I recently worked with a 10.5 X 47R in my Cape gun and have rather come to enjoy and appreciate the cartridge. I intend to use it this deer season. I did use 43 Mauser brass but can't imagine it being any better than 45-70. I had the 43 on hand and an ample supply for my double rifle in that chambering. My bore dimension is close to yours but I do not recall exactly. For what it's worth I acquired a mold from Accurate Molds in Salt Lake. It is the 40-82 WCF bullet opened up to accomodate the larger bore of the 10.5 X 47R. Tom at Accurte molds is great to work with. My final load was Rem. 9 1/2 primers, 61 or 62 grs. of Fffg Scheutzen, a .020 card wad beneath the Accurate bullet cast 25-1 and weighing 270 grs. I ended up with 2 1/8 in. groups at 50 yards. I do believe the old gun would tighten up a bit more with a little more development such as paper patching or the use of Hawk jacketed bullets which are annealed dead soft. I believe they are about 25 BHN. My chronographed velocities were in the 1370-1390 range and that calculated to around 1100 ft. lbs. of energy.
Just an FYI, my 16 bore barrel has .042 choke as best I can measure
Vic
Last edited by sharps4590; 08/24/12 05:32 AM.
