The best method I've found is to back yourself up with a chronograph. You'll find that a lot of the loads published in the manuals are bunk for your rifle, but when you get within the range of the maximum velocity that the manuals show, you'd better quit. Whatever you do, don't buy into the "case head expansion" method of measuring pressure that is so often touted by many misinformed folks here. It'll only get you hurt.
