[Hope Springs Hauler]

Keep a log so you can reproduce what worked well and not repeat what stunk.
(Powder brand and type, powder charge, bullet type and weight)
Use calipers to measure critical dimensions (include Overall length and crimped diameter.
Carbide dies are a good thing.
Get a reload manual to tell you what bullet diameter to get and charge weights to experiment with (example 45cal has .451, .452, and .458 bullets in similar weights)