Re: 300 Win Mag Loads using Superperformance powder
Nope, been looking myself. I compared some .300 wsm loads and win mag loads with the same powder and they seem to be well within 1 gr. I have though about working one up, but it seems the superformance is very specifically blended for certain cartridges so it's doubtful it will do any good other than satisfying curiosity.
"Let glorious acts more glorious acts inspire,
And catch from breast to breast the noble fire!
On valour's side the odds of combat lie,
The brave live glorious, or lamented die;" - Iliad, Book V