That's a little deal I make from aluminum plate, brass hinges, leather and a nylon draw string.
In my .308's I use: Lapua brass Hodgdon's Varget Wolf LRM,CCI BR2,or Fed 210M primers. 5 thou. jump. Bearing surface will vary a bit from lot to lot, so dont forget to always check it. Learned this the hard way....grin!
I'm getting between 2925 and 2950fps in three different barrels. All three are 1-11". Bartlein 5R@ 26", Krieger MTU@ 26" and a Rock #3 @ 24". The Bartlein and the Rock are really fast barrel's and I've pushed a few test loads beyond 3000fps. My ES is lower at 2950 or so and brass holds up better as well.