A swap back to the cylinder choke and 25 rounds of Remington Game Loads with 1oz of #8 shot listed as 1290fps later, it was MAC 1014 – 4, Shoulder – 0. He was there to test out another shotgun from the same importer, so I snagged some more bulk birdshot and a few Venom brand rifled slugs to run through the MAC, and still no malfunctions. MAC Shotgun – 6, Shoulder – 0.