Different powders have been mentioned for the 250-3000, Wootters cited IMR 3031. I tried it in my 99s, but I had more success with other powders. However, my Dad and one of his brothers used it in theirs with good results. Dad starting using it after reading about it from Harvey Donaldson. Davidson said Dupont had the 250 case in mind when they came out with IMR 3031.
