They may be similar, but not the same. I use both powders for two 300 Win. I wish they were interchangeable but they're not. One rifle shoots MRP into one hole, the other RL 22 into one hole. Swap the powders and groups open up. Luckily I've got several poounds of each.

Dunno what replaced MRP2- had a bunch of that but traded it for 217.