Take a look at Beartooth Bullets, they have several that are cannelured to take advantage of the extra length of the SBH cylinders. And they make an excellent bullet to boot.
I have also ran the Hornady 300 grain XTP seated to the bottom cannelure with very good results, as a matter of fact, one of my SBHs loves that bullet and shows it's best accuracy with it.
I run one of Beartooth's 300 grainers in my SuperRedhawk, but OAL is longer than the SBH can accept. I am also getting velocities in the mid-1300s, but I am using VV N110 instead of H110, which my SRH does not like as well as the VhitaVouri powder.