Increased centrifical force.
I am not so sure I would buy that.
I don't think I'd buy higher RPM bullets (at least monos anyway) opening up better in animal tissue either. At least not without some pretty exotic testing to back it up.
In that we can spin a cup and core bullet fast enough to when combined with the friction heat from bore travel to disintegrate them in the air. We have no evidence of that same phenomena, nor indeed of any disintegration in monos. We do have evidence of shearing off petals in extreme impacts, but that's a wholly different thing.
I wonder if Barnes has video that might support this. they could well have video showing measurable wound channel size increase with increased RPMs at the same velocity. That might tend to support the proposition.
