Well.................I don't know, That is the same load for the 3" 20 ga. and it handles turkeys just fine. They did load them specifically for the older guns w/ fixed chokes....guess that's why the look anemic. They knock the he double two sticks, out of Pheasants at 40 yds. Should handle the Gobblers at that range too. I'm going to buy a box and try them in my Model 21 Duck gun and see how they pattern.
Bill
Bill keep us posted. I've been toying with getting some for my .410

I've always wished they'd bump up their 20 gauge loads to 1 1/2, but I've shot several birds with the 1 1/4 loads. I'm going to try and shoot the #7's this weekend (weather permitting)!