Most 10's will be around .750 at the choke/muzzle, take a .785 bore on average with 30 to 35 thou of choke will get you there. The wad is plastic under great force, it's going to give rather easily. Again a 1 ounce load at that velocity is incredibly tame and it should not be causing the gun as you say to be jumping out of your left hand and make you sore after 50 shots, especially at 9 lb weight of gun which brings it down to 10.71 ft lbs of recoil. That's about the same as a 243 Winchester. I think it's safe to say it's not because the wad is too thick for the choke or many of us would be experiencing the same problem.
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