I've never gone to a slower powder after forming to Ackley and I now have five(5) of them. The powder in the former case has always worked well in the Improved case. I believe manuals will bear me out on this. For instance Norma 201 works well in the small cases w/the heavier than normal for caliber bullets like the 338F, 9X57, and 358W and I think it will work very well w/the new 338-08Ackley Improved that I'm having built. Besides that, how's a guy to know what powder is 3% slower now days w/so many listed so close together on the burn rate chart as well as moving up and down on that chart constantly. 2525 may be correct in his opinion but it is not born out in my experience after loading Ackley's for over 30 years. powdr
