I recently found the bottom of a box of BR2 primers which I have been using religiously for a couple of years in my 308 and 6.5 CM. I have a sub 1/2 load worked up for the 6.5, with a powder that has been very scarce of late (H4350). I have yet to find a load for my 308 that I am proud of. The rifle is definitely capable of better than I have seen out of it with my reloads. I have always used BR2 primers, and was considering trying something different with the Varget powder that I have for the 308. Can anyone give me an education on the differences between primers brands and at what point in the development should I be trying different things with primers. Also, is it reasonable to expect that I can use the same primer for the 6.5 and the 308? or will they have to be developed completely independently? I've been doing this quite a while, with decent success, but have never experimented with primer types. Any advice would be welcome.