1. Get yourself published reloading data from reliable sources. IMR, Hodgden, Speer, Nosler, etc.
2. Never exceed published loads. Even though the loads are designed to fire in servicable firearms from all eras, don't push it in you modern BAR.
3. Your BAR will be more sensitive to pressure than a bolt action in the same caliber.
4. Buy new brass to start and reuse those. Keep track off how many times you've fired each case. I kept plastic bins labeled new, 1, 2, etc
5. Get good equipment. I prefer RCBS, but there are others just as good. I recommend a solid press, case trimmer, flash hole deburr tool, scale, primer set tool, tumbler, powder funnel and case debur tool.
6. Always trim and debut new cases. You will get better results at the range.
7. Automated powder chargers have come a long way, but I always preferred to spoon my loads to the exact charge.
8. If these are huntting loads, start at least 5 grains under max published load and work up in half grain increments. I always built 5 rounds per given load and headed to the range. Fires from sandbags and recorded the results.
9. Not mandatory, but I recommend a chronograph. It will tell you a lot about your loads.
10. Watch for tell tell excessive pressure signs. Flattened primers, cases that "stretch" after firing, etc.
