I have tried h4227, lil'gun,h110 and w296.I get the best groups with 296.My 296 loads are 18.5g with 350g LFL with gas checks.H110 the same and h4227 i use 18 grains check you're books and work up these loads are not max but close.They will drive through almost anything.I have been playing wit 190gr and 200gr bullets in a 357 mag also.The heavy bullets are proving to be tack drivers.