MRP=R22; same powder, same manufacturer.
No, it's not the same powder, in fact, it doesn't even look the same; RL-22 is lighter gray with more irregular & more flattened granules, MRP is darker & is very uniform in particle size & meters much better.
However, I have always been able to use the same charge weights in the same rifles interchangeably, so from that standpoint, they are the same.
MM
