The Engineer
AH veteran
For light loads I use Accurate 5744 powder. My current 416 Rigby load is 42gr of 5744. magnum primers, and 400gr round nose blemished bullets that I obtained for 1/3 of the normal cost. This is a fairly light load and shoots minute of angle in my rifle. I have also used this load for 300gr and 350gr Hawk bullets with good results. A caution, this powder burns VERY hot so the barrel warms quickly and the ejected cases will burn your hand. According to one on-line barrel life calculator you should get between 12,000 and 14,000 rounds before the barrel wears out with this load.