I used to run that combo with H414. It shot lights out but I had to keep the ammo in a cooler on a 100+ degree summer day and not load them until the last minute in a warm gun because they would heat soak and then be a bit sticky. I quit using that load combo after that summer. Of the powders you listed, H4350 is pretty close and would be good choice. Similar burn rate but not nearly as temp sensitive. Start there.


Yours in Liberty,

BL