First, Vince, the folder was metal,and had no recoil pad. Most non hunting folks dread a shotgun's kick and I can't say I ever got fond of it myself out of a 6lb,12 oz riot gun with 00.As for slugs ,well...
Also,Remington recalled the ones we were using, some folks had their cheeks cut in recoil. And, it only happened with the folks who got a good cheek weld. Lawsuits galore.
What the FBI taught me about hip shooting was....
Use a standard stock with the forearm parallel to the stock on the strong hand side.Weld it into your ribs and keep it tight. Lean into the shot.
Keep the weak hand elbow locked or you'll shoot high/right.
Use only at contact ranges or when even the tiny fraction of a second needed for a good mount was too darn long.
I've probably shot 300-500 rounds of 00 in demonstrations and practice,and could put on a good show for the rookies. But if it ever really hits the fan and I'm using a shotgun, youcanbettyourwhatever it'll be wearing a standard stock and mounted.
Hope this helps and if I've not addressed your concerns, let me know. The only dumb questions are those that didn't get asked...