I had a 40X .222 once upon a time. I think it was against the law to use anything except 4198 and 52 grain Speer bullets. Quarter inch gun. A mentor gave up on anything larger than a Hornet and I ended up with 30 half cans of powder. I do remember the group it was .188 for five shots at 100 yards with 3031. The First 308 Winchester Pet loads by Ken Waters concluded that no powder was better than...3031 for 150 and 165 grain bullets (his recommendation for medium size North America game).
I like Benchmark and try it as often as I can, but, I am somewhat haunted by Orange cans of rifle powder.
