Hi, Muley Stalker. I crimp only those rifle rounds that really require it. That means tubular magazine rds., etc. I've never bother with magnum rifle rds., but I don't load the really heavy recoiling African rds. either. I suspect you won't need to for your .300 Whby. Crimping tends to be detremental to accuracy. What I do to obtain maximum for a rifle is load until I get any pressure signs at all, then back off a full 5%. I develop/test loads in warm, not cold, weather. Since adopting this method, over 20 years ago, I've had no problems. Just make sure you use exactly the same components for future reloads. For hunting ammo, I use fully resized cases, that have not been fully resized more than twice, and run all hunting ammo through the rifle before going hunting with it. I don't get excited about getting the last 100 fps out of my loads, or top accuracy. I insist on the best bullet for the job, and the best possible reliability. E.
