BC,

I use mostly the 1000 Fed. 215 mag primers I bought for this project unless I use Varget for light bullets. Varget and W760 have worked better in the short mags than I would have expected. I would use the mag primer with W760 for sure. The new MagPro and even Retumbo seem to work well in most rifles. RL-19, 22, 25 are good also if you can fiqure the speed of your lot. All the 4350's seem to be accurate if you match the load to bullet and gun. BM