This is just one youngster with an inkling of experience talking here, but when I started going through powders in my 243/105gr pill workup, H4350, which works for millions of guys and was recommended to me by a few different fellas, didn't allow me to get the speeds I was after without running into some pressure signs.
I know BradArnett uses '17 in his 243A.I. and that dood can SHOOT! I've never tried it, but a max load of Retumbo and the Amaxes kissing the lands gave me 3025 fps and shot about 1/2 inch at 100. Not comparable to some of the groups you see by the guys here, but it works for me.
looking at the 6XC page on 6br, it looks like they all love H4350 in that cart, and I know Pat uses it in his.
And yeah, I think this dog will hunt
