IMR 4064 used to be my powder of choice with jacketed bullets, read a Ken Waters piece on the Whelen and switched to IMR 3031 with 200gr. Hornady and this is now my deer load having proved itself on this fall's buck. Never thought of trying IMR 3031 with cast bullets in the Whelen although if my memory serves me right I recall using it with cast bullets in .30-30 that's over 40 yrs. ago. As regards the Unique load, I'm perfectly satisfied with 15.0gr. and won't go any higher. I am shooting a Randall Redman rebored pre'64 M/70 and intend to sell my other centerfires and use the Whelen for all my hunting.