Buy it, they go for over 700 around here but are not common. Throats run .451 - 452 but as Rick says take a .451 jacketed bullet with you.
The chamber ledge will probably be sharp. I have had them cut a nice circle of jacket material from jacketed bullets and leave it in the chamber. This does accuracy no good and will hurt cast bullets too!
If you have this problem, see Ed Harris's method of using a 30.06 case and grinding compound to smooth down the chamber ledge. I had a reamer made to cut the chamber ledge to a regular revolver chamber. It can be used to partially remove the ledge. Reaming has improved the accuracy with each of my 45 ACP revolvers. We can work out a loan of the reamer.
This is probably the best of the 45 revolvers. The 45 ACP is superb, plentiful brass, excellent ballistics, adequate power for 99% of shooting. Moon clips get you the fastest reload in any revolver, or you can use 45 Auto-Rim cases.
Steve