I recall seeing a diagram in an old reloading manual I thought was interesting. It discussed the two types of oscillation a barrel goes through on firing. One was the muzzle describing a circular path around its axis, the other was like a rope been shaken with nodes where the vibrations cancelled.
It talked about barrel tuners and load development to find a node of consistent stability.
If i remember correctly it said you can alter the barrel oscillation and frequency by changing bullet weight, or velocity till consistent groups are obtained.
Till I read this thread I'd forgotton about it, I must look through those old manuals again.
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