Update: Okay, I see that you're shooting off sticks. Good start.
Lets see if its the gun or the form! I'd like you to shoot without sticks, free hand, with your feet spread apart about 20"-24" (wider than your shoulders) with your left foot on the ground, about 80% of your leg weight on the ball of that foot. I'd like your right foot further back than the left and I'd like you have your other leg's weight 100% on the ball of that foot with your right heel off the ground. When doing shooting clinics we'd shove a 12 gauge spent hull under the right foot to remind you its supposed to be off the ground.
When you hold that rifle for a free-hand shot, pretend you're giving someone a bear hug. You're weight is on the balls of your feet and you're leaning forward like a you're reaching for a bear hug. This ensures your face is really on the comb, your weight is forward, and you're pullng that forend into your shoulder. The super-majority of weight on that gun is your left hand pulling that forend to your shoulder.
When you fire, tell me if you sway like a tree and feel like the recoil went down by 50%. If it did, lets solve for repeating this with sticks.
Do not be discouraged, a 12-year-old child can shoot that rifle of yours with less pain than a 300lb man. A big guy with heels planted is taking ALL THAT RECOIL and a light person leaning into the shot with good form above is being swayed by the breeze.
I also need to know about sights, confirm its iron sights as there can be something else going on if its an optic involved. Also confirm these are factory loads and what type.
You're dealing with 41lbs of recoil with your gun and 400gr bullets, approximately, This should be indistinguishable from a 375hh if we get your shooting form and fit figured out.
Lets hold off on recoil pads, pitch, and lengthening or shortening anything just yet. That may help, but something else is going on here we should fix first.
@rookhawk you are amazing, thank you for responding! So, yes confirmed it is off sticks, it is an iron sight with a bit of liquid paper (whiteout) on the end because I was loosing the brass button sight to the black target and couldn't see it very well. It eats a standard off-the-shelf Hornady 400gr bullet (both the soft and the solid since I'm trying for buffalo). I will do as you asked, I will also go one better and get my wife to take some picutes of me holding it like I normally would, both on and off the sticks, as well as a video (is possible, you would think I'd be more tech savy but here we are!) so that you can see exactly for yourself what is going on. Thank you so much for your help with this!!
Make sure it is fitted to you. It likely is too short. You also need to get busy and have an Edwards Recoil reducer installed. The cheek slap is actually something it will really help with. If you will tell Kevin at Edwards that when you talk to him, he will take that into account on how the reducers are installed.you can send the stock to him and have it done.Good afternoon all! I am coming to you for advice. I recently picked up a 450/400 double for my first buffalo hunt this October and while I love the gun I am rapidly begining to hate shooting it. I have, and shoot, a 9.3x62, a 375 H&H and a 404 Jeffery, none of which react the way this one does. It's not the recoil that is throwing me off, in fact the recoil is very managable! It's the fact that the gun seems to want to "hop" up and slam into my cheekbones every other time I pull the trigger. I don't know if I am holding it wrong since I am used to scoped rifles which may need to be held higher, I don't know if the cheek-rest is off (I hope not, the wood is beautiful) but for some reason about every other shot it wants to leap up like an impala and slap my cheek as hard as it can. As a result, I'm developing a flinch, not just with this rifle but with all my rifles. I even flinched today when I was shooting my 270, and that gun usually kicks as hard as a sleepy kitten. I need help, suggestions, advice, something! So please, give me your thoughts, your ideas, anything at this point because this is becoming a serious issue! Thank you.
Well I'd love to have a fitter take a look, unfortunetly I'm stuck in Albuquerque NM and that's a bit of a walk away from London lol. Not many people in this neck of the woods have experiance with one, I took mine to a gunsmith here for an issue, he's been around the block a time or three and it was the first double he had ever worked on.
Rookhawk, would you mind explaining please? I would have thought that is is the other way around - if your cast was correct with a too short LOP, then you would have to lessen the cast in a longer stock to have the sights lined up. Are you saying that his gun has too little cast and he therefore needs to push his face hard into the stock to achieve the correct sight picture?