For primers all I use are Tula's and BR-2's. Spent most of the summer looking for a pet load for midrange with the 105 hybrids. Same take on it as xdeano's thoughts...high bc. pushed faster than the 108's & 115's. Descent 105 loads yielded 3110 w/4831sc and 3145' w/4350. Accuracy just wasn't what I needed when comparing them to my 107smk load and when I tried dtac's w/ h1000 & 4831sc groups real shrank. As Robert mentioned some powder lots do vary as well as barrels. I have 3 barrels for one rifle and 2 are identical in speed & accuracy but the other is a slug when it comes to velocity. Good luck with your search. Eric in DL