Bill,
Hornady sells some case receptacles that will chuck into a drill. The kit comes with special paint that melts at precisely 475 degrees F.
Chuck the receptacle into a cordless drill. Paint a dot of the special paint on the top 4th of 3 or 4 cases. Plop a case into the receptacle, dim the lights, & hold the case mouth into a propane torch flame while the case spins. When the paint melts, note the color of the case mouth. It will be a dull red. Immediately dump the heated case into a contained of cool water. That makes 1 annealed case. Repeat with the other painted cases. After a few cases, you will be able to judge the color & run the remaining cases w/o application of the paint.
Unfortunately, the Hornady kit does not come with a tool large enough to accept the rim size of a 56-50, which is what you have if I recall correctly. the receptacles in the kit are also too tall for the 56-50. But, if you take one of the receptacles to your local machine shop & have them make you one out of aluminum that will fit the 56-50, it will cost you about $20 bucks. If you know how to run a lathe, your are in business for the price of about 4" of 1" round stock.