NV: Suspect you will find what we did with 7828, H4831 ec, that those older sing base powers were good back in the day, and still work with lighter bullets,,,,but the newer slower powders do a better job in the larger case with the bullets 160 and up. Things like R25 (have not tried 26 yet), H1000, retumbo etc. just give better results.
Noticed the same with the 7mm Dakota which is a really a belt less Mashburn for practical purposes.
