Rocky, dip into your memory banks
I have the vague recollection that Alliant bought their rifle powder from the same plant that made Norma powder. MRP was marketed when Norma also made 204, 203, 202, and 201 powders. Seems to me that Norma MRP corresponded to Reloder 22, and 204 to Reloder 19.
Norma 201 was similar to Reloder 7, and Norma 202 similar to Reloder 11.
I'm not sure if 203 was Reloder 15, and Reloder 15's been reformulated lately, anyway, so that might be way off.
Can't say I've used Norma powder, either, for the same reason Rocky stated- Norma powder has always been very difficult to get in my area.
Anyway, Rumlover, if I'm remembering right, Norma MRP won't be significantly better or worse than Alliant powder.