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Barrel harmonics aside (don't know enough to comment), I recently had the displeasure of watching young Marines trying to zero with iron sights at 25y. Shooting unsupported prone, none of them could shoot a group tight enough to even begin to know what adjustments to make.
Had they placed the mag on the ground, their groups would have tightened up enough to at least enough to make adjustments with some degree of accuracy.
(Better support from the mag on the ground would have greatly outweighed any issues with barrel harmonics.)
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