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Milu,
You have a couple of factors in the twisting. One is the torque as the bullet engages the rifling. I know some smart benchresters have mathematically de-bunked this on their rifles but I’m not so sure. Try a 3” S&W 29 w/ Magnport. Shoot heavy 300 grain, heavy 180 grain, and light loads. Notice the torque difference.
Also just the mechanical reaction of the pistol in your hand, it’s uneven compared to say a ransom rest.
S/F, FOG
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