What is the theory of recoil reduction in stock?
Looking on the web for ideas to reduce recoil for my 12GA, I've come across a few ideas, some very expensive.
Two cheap ideas was a steel weight with springs on both sides inserted in the stock hole. And the other fill a container with lead with no springs and inserted in the stock hole (can't tell if it's meant to slide or just add weight). Then there is the Edwards mercury, etc.
Is this weight suppose to slide? If so, is the weight best to start at the back by the pad and slide forward on recoil?
Would this few ounces of weight help much with magnum loads?
Any homemade recoil reduction ideas?