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jephthai, yes, bullets with different bearing surfaces will probably exit at different places in the barrel's whip cycle. But the difference between the two won't be significant. At .30-06 muzzle velocities, it takes about 2.5 milliseconds for a bullet to go from case mouth to out the muzzle. A few millionths second either side ain't all that important. I've shot bullets from 168 grains through 220 grains in the same barrel, each easily holding 1/2 MOA at 300 yards at muzzle velocities from 2700 down to 2400 fps. I know they're not all leaving at the same place in the barrel's whip cycle. And shot 190, 200 and 220 grain bullets from a 30 caliber magnum barrel that all shot about 1/2 to 5/8 MOA at 1000 yards; they leave at different places, too.
Regarding the "node" of a whipping barrel, that's when it's straight out without any bending. The "antinode" is when the barrel's bent the most. Best accuracy typically happens when bullets leave just before the "antinode" so slower ones leave at higher muzzle axis angles and 'cause the drop more way down range, that's compensated for. Some folks "tune" their barrels with a weight on them so best accuracy happens in some range band some distance away.
jephthai, you're not crazy. You're thinking. And asking good questions; a sign of intelligence. Bless you.
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