Those look alot like the ones I got from Brian Erickson of New Era. They are basically a 28ga load in a 16ga. I have a few left that I'm hoarding but now that I know Dave's loading them up again
They work well on the Grouse and Woodcock that I've used them on. All I have are #8 shot so no Pheasants
, but loaded with 6's or 7 1/2's they would work fine.
Dave are you in the ammo business now? I bet these are for a gentalman with a English gun chambered for 2 inch shells.