I've had good luck with H4831 in three .280 AI's, but along with RL-26 am also going to try IMR7977 in my latest, since it also looks to be just enough slower than 4831 to possibly work very well. Like 26, 7977 is double-based so should provide a little more zip.
Im pretty comfortable with standard rifle primers with the H4831SC and R17, but am wondering if with R26 and the 7828 if I would be better off with Mag primers.
I have 5 thousand standard rifle primers but seems mag primers are getting hard to come by. For a month now I've not been able to nail down any mag primers of any kind.
