I have quite a bit of this powder. Dad got it when it was dirt cheap years ago and I inherited it from him. Used some in jacketed 7mm Rem Mag loads years ago and it worked OK for that. Always figured it would only be good in large case capacity, over bored things like that.
I've been playing with a .458 I got from a member here a while back, lots of fun with a 500 grain RN cast and 18.5 grains of Unique. This is a pure range toy, no intentions of ever loading it to full potential.
I seem to remember Dad mentioning back when he was using the stuff that the best thing he used it for was .45-70 and that he pretty much used a compressed load, all he could get in a case and used a small priming charge of some faster burning powder under it. His memory is pretty foggy about such things now, but I do remember the conversation and remember he was pretty happy with the accuracy, but did mention it was dirty.
Would this recipe or similar work in my .458? I'd use magnum primers, but would a light kicker charge be good? What kind of powder and how much? I also just got a bag of fiber wads for shooting BPCR loads in .45-70 from an old guy at a yard sale, would these help with the plain based bullet?
I really don't like the idea of making up load data, though I have sometimes carefully interpolated from other things and been OK. This stuff, though, I just can't see how you could get enough of it in a case to be dangerous.
Anyone have experience?