Dennis, Ed, to many letters and me spent several day's testing different powders and .458 bullets
Tried H-4895
IMR-4895
Benchmark
SR-4759
IMR-4064
3031
With 400 gr Soft
420gr. Hard Cast
450 gr. Soft
500 gr. Soft
500gr. Solid
500 gr. Hard Cast.
WE made up a good reduced load with Accurate 5744 works very well.
I am sure there other powders that will work, none of the above powders were terrible, but 3031 just turned out to work very well in my .450 H Rio7
