Here's a load from Handloader Magazine writer is using a super red hawk 7.5 inch barrel.
He list a 310 oregon trail true shot bullet WNFP-GC H110 23.0 grains for a velocity of 1,495 COL 1.645
300 grain hornady XTP Lil'Gun 22.5 grains for a velocity of 1,386 COL 1.734
This is from the April 2010 Handloader magazine in an artical called +P loads for the 44 mag. Those loads listed were max loads and the PSI is 45-48,000 PSI. Work up slowly! Also these are loads for Ruger only firearms...specifically Super Red Hawk with it's LONG cylinder and brute strength.[Weight]