Morn'in Southern Shooter,
My normal go to load in my 5.5" RUGER Redhawk, is a 310gr. LBT bullet ahead of 19gr. of AA#9.
This gives me a vel. of just over 1300fps. The Redhawk handles this load very well as a steady diet, and it is very shootable in this heavy handgun.
I have found however, that prolonged shooting of the heavy bullets in a Black hawk, can cause some damage/problems with the cylinder base pin and at this point would only want to use the heavy bullets in the single action if also using an after market base pin with the locking screw.
That said, the Redhawk take a lick'in and keeps on tick'in!
Keep em coming!
Crusty Deary Ol'Coot