Hello everyone I’m new to the group and hate to ask a question that’s been asked 100 times but I’m new and not really tech savvy. I just bought an unfired Winchester super express in 458 Winchester magnum made in 1981. I ordered some cutting edge 450 grain flat nose bullets and im searching for load data. What I have shows 3.310” as suggested oal and I have H322, 3031, 4064, 748, and other suggested powders. Any help appreciated. I’m going to shoot some hornady 3-350 for plinking and have data for those bullets.