Um, are you sure it's the bottom of the mag in the well? I have a .375 H&H, and about as far as you are with a Boyd stock. My action wouldn't fit quite right, but on inspection it was the rear wall of the mag well - it wasn't extended rearward enough and the mag was hanging on that rather than contacting properly on the recoil lug. That's a lateral fit, but it would also stop the mag from sliding down to the bottom of the well. Might want to double-check.
KeS
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