Changes in how you hold the rifle is what changes where bullets strike relative to aim point. The bore axis points to a different place when the bullet leaves. Bullets strike to the right if there is more resistance to recoil to the left. They strike high if the butt is lower in the shoulderBart--my particular gear and shooting style--as mediocre as they might be--I've noticed that even changing the rifle position (particularly elevation) to adjust to the POA can affect the barrel harmonics enough that POI shifts--that's why I sought to test minimizing changes in the actual rifle position. Maybe I'm nuts though.
A free floating barrel's muzzle axis resonant and several harmonic frequencies are fixed by its shape, they don't change from shot to shot regardless of hold.
Many folks get better accuracy with rifles shot slung up in an F class prone position compared to a bench rest position. I am one.
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