Dantforth
Blackhawk
I have tried all sorts of factory ammunition in mine and find that Remington "RMG3" 240 grain hollow points work far better than others. I also tried reloading early on with mine using 240 grain bullets and "2400" powder. I developed problems after this and found that the casting holding the trigger group had cracked. Ruger had a fix then but now they do not. So, just an opinion, don't experiment with heavy loads! David