I have been reading a lot of posts about Unique is the universal powder for cast. I just acquired a 45-70 govt for my christmas present to me and was wondering if there are other pistol powders I could use. There is no Unique to be found near me. But I do have HS-6 which is close but slower and AA#7 which is slower yet. The next powder I have that comes close to a fast powder for reduces loads is H110 or IMR4227. I would prefer to use the pistol powders because the only thing I'm hunting are X-rings on paper. Please help if yall have some input. My bullets mold weight is 405 grains. Rifle is H&R Handirifle only weighing 7lbs. But I only weigh 135 with a bad spine.