Bernie, for general shooting and Cowboy matches, the 'cowboy ammo' loading will do you just fine. I think you mentioned in another thread you have other pistols for self-defense, so it shouldn't be an issue.
At the same time, .45 Colt is no slouch in usable horsepower. The Hornady ammunition for defense will probably do it proud. It's got more sand than a lot of 9x19 loads.
AND, this revolver may convince you to start reloading. Store bought ammo costs too much for 'fun' shooting, which this will be.