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wncchester, as far as I know, all bullets, regardless of their shape at the back end, change direction somewhat when they go from supersonic to subsonic. That's why Lake City ammo plant quit using Sierra 168's in their 7.62 NATO match ammo; they went subsonic around 800 to 900 yards and accuracy was deplorable at 1000. Sierra's 175 HPBT replaced the 168 and its longer boattail keeps them supersonic through 1000 easily. That's also why the US Army changed to a 173-gr. FMJBT bullet in the 1920's for the .30-06 long range machine gun use; the 150 spitzers in standard ammo too often went subsonic before reaching 1000 and their accuracy wasn't what Uncle Sam wanted.
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