With double rifles and drillings: If the shots cross the bullets are to light or to fast. If the bullets shoot apart they are to heavy or to slow. Your drilling is crossing. Try a heavier bullet and or a slower bullet. With shotgun velocities, an inch or two spread at 25 yards (left on the left and right on the right) you should have a close group at 100 yards. I am envious. Always wanted a drilling and 7x57 is an all around great cartridge. You might go with a standard 175 grain load at modest velocities.
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