Re: Wax Shotgun Slugs???
Don't do this on a full choked barrel, you'll split or bulge the barrel just behind the choke restriction.
Pouring melted pure beeswax in the shot cup is much safer than cutting the case. Sometimes the crimp will open, contents exit barrel, and leave the casing in the bore, waiting for the next round like a squib load. Result at best is a bulged barrel.
The beeswax trick works great in the Speer shotcaps for .38, .44, and 45. Doubles the pattern range. We tried it with the cap full of piano wire pieces and wax. Probably wouldn't be fatal, but if it hit you, you'd wish it was.
And don't even think about having these on your person during hunting season! Fines are the same as if you had buckshot during goose season.