That line drawing helps a ton! Also do you happen to know where I can get a pair of shotgun barrels for this double? It's a chapuis and I haven't been able to find any! Of course, to be fair, I haven't seen any shotgun barrels for sale for any rifle, maybe a Blazer, not sure though.Okay, another photo. Your head is rolling over the top of the stock. Ouch!
Imagine you have a broken neck. You are forbidden from moving it left and right. It stays straight. However, you’re allowed to move it forward. Bring that elbow up closer to a shotgun shooting stance to make a deeper shoulder pocket. Do not roll your head over the top of the comb. Your head moves forward and sits on the side of the comb. And in one photo, the butt plate at the heel is an 1” low on your shoulder. Again, get that comb up by bringing the elbow up.
Also, you’re holding the forend which seems reasonable as it looks like a grip. It’s not a grip, its a wood object to hold the barrels on. Get your forehand further forward on the forend near the juncture of the forend and the barrels. Many folks actually point with their index finger on their left hand. This is helpful because you instinctively will shoot at things you point at. Point your finger down the barrel with it sitting in the recess of the lower rib. Your palm on left hand will be holding the rounded front of the forend.
And above all, you are shooting off your heels and you’re all bent backwards. You should be almost off balance so if your wife gives you a modest shove from behind, you should fall forward on your face. You’re just the opposite, trying to put all your weight on your heels and you’re arching your back and pushing out your stomach.
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I wish you lived near me. We’d fix all of this over a two day shooting weekend of side by side shotguns and a case of 250 rounds of light loads. Then you’d shoot your double rifle 10 rounds and feel cocky-good. Your form shows you are not a wingshooter and you do not own side by side shotguns. If you really want to be great, go get a SxS and you’ll build a lot of muscle memory very quickly. Even better, get a pair of 20 gauge barrels for that double rifle and shoot the hell out of them.