ORIGINAL: Roskoe
If the RPM theory held any water, bullets would suddenly become unstable as they slowed down in flight to the target - the faster ones would just get further downrange before encountering this in-flight instability. And we know this doesn't happen . . . .
Ah but while air resists the bullet in such a way as to slow it down, it hardly effects the rpms at all, they do decay, but not to any great extent.