P.O. Ackley's "Handbook for Shooters and Reloaders" is the classic reference, but much of the loading data is very dated.
Start with a good load from a loading manual for the parent round, and increase in 1/2 grain increments, being very careful about pressure. AI's typically do not give the usual pressure signs, but will suddenly have a scary sign show up... Use your chronograph, and stop when the velocity goes strange, like an increase in powder gives a decrease in velocity, or it only increases by 10-25 fps. Back off the latest increase by 1/2 gr., and play it safe.
"A Varmint Hunter's Oddessey" by Steve Hansen, addresses the AI quirks nicely.
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The Bill of Rights, and the Golden Rule are enough for civilized behavior. The rest is window dressing. Shoot carefully, swifter...