Howdy
He said '45 LC Colt Cowboy revolver'.
The Colt Cowboy was a single action revolver that Colt introduced in 1998 to compete with the Ruger Vaquero.
Nowhere near as expensive as the real Single Action Army, and like the Ruger it had a transfer bar to make it safe to carry the cylinder fully loaded. When it was initially offered, there were quality problems and it quickly got a bad reputation in Cowboy Action Shooting circles. Colt did clean up the Cowboy's act, but the bad reputation it had gotten killed it and Colt only produced it for a few years.
I had a chance to shoot one a number of years ago. It behaved fine and did not seem to deserve the bad reputation.
The Colt Cowboy was capable of digesting SAAMI max 14,000 psi loads. Any commercial 45 Colt load should be fine in it. If you go to Buffalo Bore ammo, be sure to read on their web site exactly which ammo is OK for modern guns such as the Single Action Army or Italian replicas, and which ammo is not.