Originally Posted by
Don McDowell
When you get that chamber cast done, you might also want to take a measurement of inside of a fired case mouth. Then you'll want to be looking for someplace to order a proper patched bullet mould that will drop a slick from you're 20-1 about .004 or 005 under the diameter of the inside of your fired case mouth. In that 120 16-1 alloy may groove to give you much less problems with nose slump.
While the Pyrodex Rs might work, you'll probably find much better results with 1f black.Get a bunch of it because you're not going to get many rounds from a can of powder. Some .060 fiber wads or LDPE wads will probably make life better if you're looking for nice sized groups.