In your case, the 6.5? would be the choice I?d think. Extra Velocity.
I?d want the 4.62? simply because I already have a large frame single action with a longer barrel.
PsTaN
-Smith & Wesson Model 69
-Ruger Super Blackhawk Hunter
-Encore Pro Hunter
"Hold your horses, the elephants are coming, and out stamped Alabama"
| 
