I saw a post where the Ran Shot technician said R22 & MRP were not the same powder. I don't know if this was motivated by Ram Shot being the importer of Norma powders are not. Even though the loads will usually interchange I still think there are differences with MRP being more consistent and uniform. It may be less affected by temperature variations but for sure the lot to lot variation is less with MRP.

"When you disarm the people, you commence to offend them and show that you distrust them either through cowardice or lack of confidence, and both of these opinions generate hatred." Niccolo Machiavelli