After shooting Lightfield's out of my 12 ga I'm definitely convinced to try them out of my 20 ga. Shot 2 deer this year at ranges from 35-60 yards, both dropped where they stood with nothing but a couple flickers of the tail. I've shot a few deer over the years at these same ranges, and never have I had one drop in their tracks, until now. I've spoke with Randy from Tar-hunt who does all the R&D for Lightfield, and says the effective range of these slugs in a 20 ga is about 110 yards. I've also spoke with my gun smith who's specialty is accurizing slug guns, and his slug gun of choice is a 20 ga with Lightfield slugs, and he has shot deer according to him at ranges of 150 plus yards without having to track an animal more than 20-30 yards. As he's told me, when you use Lightfields, when the smoke clears your deer is lying right there!
I do agree that some of those copper slugs have better ballistics, but I've had such a problem with fliers from the copper slug and the inconsistent size of the sabot not spinning together, that I had to look at other alternatives. I've always been impressed with the supposed performance of the Lightfield, but after doing some research and finding out about their locking sabot/slug system and how the sabot stays inplace, even when the slug becomes sub-sonic and accuracy can go a rye fast, I tried them. Amazing not a flier in the bunch, along with tremendous accuracy. I would say if you stick the ranges recommended by Lightfield, should be a solid performer in the field.