Gentleman, the method in my madness relates partly to what Gunman has posted above. 3 1/4" was a fairly common chamber length for heavy English 10's of this era ( 1890) although they were black powder proofed and not at the magnum pressures of our modern 3 1/2" guns.Thus we retain some historical integrity. Being as how I reload suitable loads for virtually all my vintage guns,I don't really want to subject the action of the gun to excessive proof pressures unnecessarily. If 3 1/4" chambered guns can be nitro-proofed at the lower 900 Bar level, with the use of longer forcing cones,I would feel comfortable reloading and using 3 1/2" cases loaded to suitable pressures. This makes it easy to get and load modern components etc.
If they only re-proof 3 1/4" at the magnum level then we may have to rethink the whole process.....
