Marshal mentions this cartridge in his article on "Dies for the Ackley Improved Cartridges" in Tech Notes. Seems like this might be a good way to add some zip to the old round without breaking the bank. Does anyone know anything about this round? This is the first I've read about it. What are the dimensions? What boost is power could you expect? And most importantly, will it feed thru a re-chambered Marlin 336 without much modification? A chamber reaming would certainly be cheaper than converting to 356 Winchester.