I have had great sucess with RE23 and 115DTAC's. I'm slow at 2950fps. but my ES's are single digits. and at 1200 rounds down a 1-7.5 Hawk Hill I'm still at an ES of 4.5 last week at 3000 Density Altitude. I borescoped the throat and to my surprise I don't see the erosion like H4350 will do.