For those who like .44Mag, but want it in a semi-auto with less recoil
Magnum Research now has the all-new .429 DE, essentially a necked-down .50 AE, the .429 DE uses a sharp 30-degree shoulder with a neck long enough to hold a 240-grain bullet without set back under recoil. Capable of producing velocities in the 1600 fps range with 240-grain bullets (and 1750 fps with 210s), Magnum Research says the resulting cartridge has a 25 percent uptick in velocity and 45 percent increase in energy over a .44 Mag from a 6-inch barrel.
The .429-caliber barrels, to be released in a range of finishes, will be compatible with any MK19 or Israel Desert Eagle Pistol with a wide (.830-inch) rail on top of the barrel and uses a 50AE magazine and bolt.
More in my column at Guns.com.