Messages. 12. I ran 1 oz loads in my 940JM all dove season last year as a reliable test and it worked great. Made a plug out of an old carbon arrow. I did deburr the recoil spring. Mossberg 940 Pro Turkey 12 Gauge Optic Ready Semi-Auto Shotgun with Mossy Oak Greenleaf Finish. $1,120.00. $879.99. In Stock. Style: 85156. Department: Firearms > Shotguns > Semi. In 2020, Mossberg unveiled its 940 JM Pro semi-automatic competition shotgun designed by likely the best all-around shooter in history, Jerry Miculek. It's a gun conceived to compete with the best gas-action semi-autos around, yet thanks to Mossberg's well-oiled production line and its sales volume, the 940 is priced significantly less. The new 940 Pro Autoloaders. Inside, you will find a durable gas system that allows for up to 1500 rounds between cleanings and a host of corrosion-resistant internal parts (boron-nitride coated gas piston, magazine tube, hammer sear, return spring tube; chrome-lined chamber and bore; and a stainless steel return spring). What resulted 18 months later was Mossberg’s new 940 JM Pro, a nine-round-capacity, gas-operated gun with a 24″ barrel and all the necessary upgrades to make it race. May 08, 2022 · This week, we’re taking a closer look at the Mossberg 940 Pro Waterfowl. Ideally suited for hi-volume goose fields and duck holes, the 940 Pro Waterfowl is built around the same clean-running gas-vent system as the rest of 940 Pro lineup. A chrome-lined chamber and bore help prevent corrosion in wet weather and swamped boats, while a HIVIZ .... The 3-inch shell had a muzzle velocity of 1,550 fps and a 1 1/8-ounce charge weight. In terms of pattern percentage, Mossberg’s 930 fell in the middle of the pack. Its best pattern places 113 of the 140 pellets (81 percent) inside a 30-inch circle. The pattern had some noticeable holes through which a duck could slide.