Mind if I make a suggestion? A
shoulder-worn recoil pad as opposed to a gun buttstock
fitted recoil pad. After all, then you only need one, and it fits on you, not on the gun, which is probably a whole lot easier.
View attachment 1021446
Personally, I find the "Limbsaver" buttstock-fitted pads to be too sticky.
Wiscoaster offers the best solution for your situation. Putting a modern recoil pad on the Gustloff is akin to putting electronic ignition on and old flathead Ford.
But if you are still determined to do it, I recommend Kickeez, Microcell, Pachmyr Decelerator, and Limbsaver.
Watch this. This is why my shoulder hurts haha.. well that didnt hurt too much.. but 30+ rounds through made my shoulder blood red today. Look at the recoil and how that knocked my shoulder back hah
https://youtube.com/shorts/gC5lbcgJ6h0?feature=share
I'll reiterate my advice from the thread you originally posted this in:
1. Don't pull both triggers at the same time. I have a nice arthritic lump on my RH trigger finger from doing so in my youth.
2. Don't shoot hard kicking guns while wearing smooth fabric shirts; nylon, rayon, poly, silk, etc.
3. You need to have solid rearward pressure into the pocket of the shoulder when firing, particularly if it has a hard buttplate.
You had that hard buttplate out on your arm. Try standing squarer to the target, it forces one to bring the gun into the pocket, that area in between the collarbone and the arm joint where the deltoid is thickest, and can absorb the recoil better. A slight lean forward from the hips helps, as does a slight bend to the knees, the left a bit more than the right.
Shooting from that position, even both barrels won't cause what you experienced in the video.