I sort of put it down to the wall thickness of the projectile nose section ahead of the 'driving band' being thinner and more able to expand. It's not much thinner, but with these little pills it doesn't take much to make quite a big difference in performance (eg. the difference in effectiveness between a 2.5mm hollowpoint and the same in 3mm as noted with the dies above). Win called it a 'truncated cone' - the wacutter for me was always a cylindrical bullet with a recessed face. But yes, that style bullet was the most effective I've used by a country mile in the .22's regardless of any other factor. I'm a bit gutted you can't get it easily now, and if you could get a die to form them reliably out of round nose target pills I'd be keen for one!
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