Ok, sounds like you're on the right track. However, you also have me worried when you say, "So far it has only been off +/-1 gr.". It's not totally clear how you are measuring your actual loads used in your rounds, but if you are allowing a plus or minus one grain tolerance then you stand to be in trouble with max loads and/or any load with a faster burn rate such as Bullseye.
Please verify what you mean by "So far it has only been off +/-1 gr." What is "it"?
Please verify what you mean by "So far it has only been off +/-1 gr." What is "it"?