I've started back testing my 20ga slug gun.
I received a new sizing die from fishawk so I can size some slugs to fit nicely into my shotcups. It works beautifully! Before my boolits were either undersized, not good, or oversized, wouldn't fit. Not anymore!
I also learned a few things in the mean time. Specifically, that the wad column under the slug needs to be hard!
Here is one of my more successful 3 shot groups. Yes it's only 25 yds, but it's a start. If it won't group at 25 yds, there is no hope farther out.