So, what happen to it? What was the reason it fell out of popularity?
almost. 10 gauge has a shorter shot string which means more pellets on target in a shorter amount of timeSo to put it simply, the modern 12 gauge can do everything the 10 Gauge can do, and more, with better efficiency.
but if you use a Remington SP10 which weighs 12 1/2 pounds it feels the same as an 870 supermag 12. the extra weight of the gun helps keep me on target with the flock for follow-up shots. I spent a day using a friend's for a day this fall.And it kicks like a flippin mule..