I like Benchmark and try it as often as I can, but, I am somewhat haunted by Orange cans of rifle powder.
Probably because Benchmark is basically a short kerneled version of 3031 burning speed.
I have a 1969 IMR reloading guide, where 3031 is pretty well established in the 223 and 222 Magnum loads with 50 & 55 grain bullets, often filling the case before peak pressures are reached.
Benchmark allows that burning speed to fit in these cases.
