I'm still shooting 4831 and 4895 WW2 surplus powder that my dad bought from Hodgdon back in the day. Dad used to get 50 lb kegs for about $.50/lb. I think that's how Hodgdon got started, by selling military surplus powder. Occasionally they would throw in a 1000 primers! Now I see people paying over $200/lb for Retumbo on GunBroker. I just paid $100/lb and I bet dad is rolling over in his grave. Our powders have always been stored in air tight containers. If there is any discoloration, streaking color, or lumping, I'd dump it. I'd also certainly start at minimum loads and look for pressure. Nobody is going to tell you its OK. None of us can know for sure. Just sharing my experience with old powder. Good luck!