John I have used them. I bought a bag years ago and still have some left. They work fine but I found them rather tedious to load even on a single stage MEC. In order to keep the drop tube from crushing the wad I would start by placing a tongue depressor between the tube and wad. I believe you can install a steel shot drop tube and avoid this problem but i never did it.
After that experiment I went to the X-stream inserts for spreader loads. They simply drop into the shot cup and then you add shot. It's still a slow loading process but I found it easier to do. I can also use the X-stream insert in either 12ga or 10ga. On the pattern board they opened the pattern of 1 1/8 ounce of lead 6 from 92+% to 57% in my Remington 1894 10ga.
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Progress is the mortal enemy of the Outdoorsman.
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