I don't know that I would ever have gotten my double to shooting without Wright's book. Mine is an old "E Goldmann in Erfurt" on the Lefaucheux action. It's a pretty decent rifle and was my first double so it isn't going anywhere. My bores are .446 and I finally bought a .447 die rather than continue using the .452....and the attendant lube leakage.

Several years ago in The Double Gun Journal, J.C. Munnell did an article on the 11.15 X 60R and found groove diameters all over the place. Some as big as .450 and I think some as tight as .430.

Good luck with yours, 85. It is a good cartridge and I've taken one doe with mine. I think the RCBS bullet would make a better hunting bullet but I never could get it to regulate in mine, whereas the Lyman came to its milk fairly quickly, once I duplexed the load.