No, never used it. You get that from Hi-Tech Ammo??I have gotten some powder from them in the past.About 10 years ago I bought a 4# jug of SRB-118 (I think it was). I used it to work a load with the 175gr Sierra MK HPBT in my .308 Wintacticall rifle. I was amazed when the chronograph lit up at over 2,900 FPS when we got higher charges, with no pressure signs, and sub- 3/4 MOA accuracy.

For my 7MM RUM, I use Accurate Arms 8700. With the 140gr B-Tips my load is 115 grains. With the 160gr AccuBonds, my load is 111 grains. One thing to note is, that I do not seat the bullets to feed thru the magazine. I use it as a single shot, so I seat the bullets so they are .0005" off the lands, and when seated that far out they will not fit into the magazine, but it allows me to get acouple extra grains of powder in the case.