Federal mag. They contain Nitroglycerin.
https://www.shootingtimes.com/editorial/ammunition_st_mamotaip_200909/100079
https://www.shootingtimes.com/editorial/ammunition_st_mamotaip_200909/100079
X-2I've tested 215m vrs 215 not one bit of difference on paper that I could shoot the difference
WLRM primers are the hottest out there. I had similar results while working up loads for one of my 300 WEA's.300 rum w/ wlrm primer load went to 89.5 to show ejector
same w/ cci 250 got to 91.5
i know them numners are low for a rum but thats what i ended up at
there could have been other variables that i missed but im always cautious now switching to winchesters without dropping charge a little