Q. (I tried the search funtion with no joy)
I have yet to use any Norma 204. MRP has worked quite well in several cartridges. (I load .22-250, .270 Win., .270 WSM; .280 Rem., .308 Win., .30-06, .300 Win Mag. plus a couple others not likely to be suitable...) I thought I had seen a refence here but may be mistaken. Were there some cautions mentioned about (ignition, pressure spikes/ inconsistencies, or other)? I may not even be recalling correctly if it was Norma 204.