Re: long range .223 anyone?
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... I would say that 800 is possibly doable but you have to watch the supersonic/subsonic barrier. Bullets loose stability VERY rapidly after they go subsonic (about 1100fps I think).
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I think this an old wives tale brought on by the 168 Sierra MK. When shot in 12" twist barrels and low (2500-2600fps) speed - at 1000 yds, it is marginal, and often flips... but it is NOT because of going below the speed of sound.
The same bullet shot in a 10" twist barrel never flips, even at 1200 yds (far below the speed of sound).
I have watched tracer ammo travel long after they were below the speed of sound, and never saw them go unstable.
Here, kitty kitty kitty.
LRH member #23