Re: New powders for more speed
I personally don't think the 223 has enough capacity to get any benifit from reloader 17. Maybe VV530 or VV540.
I tried Re-17 in a 6mmBRX w/o much success.
I am getting better velocity in a 284Win using Re-17 but my extreme spreads are greater too. I think it is oing to be hard to be H4831SC or H-4350.
The 223 needs a faster powder due to its case size. BLC2, W748, Varget, Tac, and almost any of the faster spherical powders.