38-55, It's a good bullet (454423), and that size (.4525") should work well in your Ruger. I had my NV opened up (cylinder throats) by cylindersmith to that exact size...geez, he does beautiful work...cut my groups in half. I'm very partial to Win 231 or HP38 for ~800 fps loads in .45 ACP, .45 Auto-Rim, or .45 Colt...
BTW: What size are your cylinder throats? Mine were down around .450"-.451"
Also...you might try swirl lubing (is that the term used for the Lee Liquid Alox in a butter tub method?)...In both .44 Spl and .44 Magnum, regular Lyman bullets (429215 Gc and 429244 Gc) actually shot better with the "slosh" method than with the lube/sizer. By juggling the alloy a bit, I was able to get them to drop at .432" then sized them to .430" but did not lube with the 450 machine, I swirled them instead, and padnuh, they shot like a house on fire from my Rugers. I've got a cpl of sub-1" gps from 25 yds with them, and the average isn't much bigger! BTW, I thin the LLA with paint thinner by about 30% and heat it a bit too...a little (Like a single 3" squirt) goes a long way and will lube up 50 or so bullets. It's the easiest lubing I've ever done...now if I could just get the slugs to drop at .430" or .431", I'd be in hog heaven...no sizing that way!
The only draw back to the "swirl" method is that the bullet noses get pretty well gunked up too...I just shoot them that way, but pushing them down in the loops on my favorite gun belt is out of the question...pocket carry would be messy too with out a zip-lock bag.
HTH's Rodfac