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Originally Posted by longrange1947
That is why alot of the ballistic "predictor" programs fail as they do not take into account that the BC changes with velocity. Sierra, atleast, shows three to four BCs with speed envelopes to get a basic prediciton. Presicion Workbench uses a modeled curve based on actual performance of your bullet/weapon combination at specific ranges.
As the velocity approaches trans sonic it falls off rapidly and then during subsonic shift it jumps back up. It flies really well but is very suseptable to any changes in air resistance as from wind shift to thermals. The round is spinning at a higher ratio to forward velocity so the round is now nose high and overstablized (gyroscopic) making it even more suseptable to violent tilts in axis, just as a gyroscope tilts once upset.
Predicitng bullet flight at those speeds is right next to impossible as so many things come into play.
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I'm stealing this one also....Is Ed still out there or are you the only civilian working there? I heard he retired, or was sick. Ill be back late June. Might just work locally after this. I never thought I would say I'm getting tired of Bogotá. Let me know if you need anything. I'm getting some gear made here. Just for personal use or a gifts, not selling it. Me and Doc have something for ya.
It's still cheaper to have stuff made here but not as cheap as it use to be. We don't use Commando DE Selva as much, couple of other Gear makers have sprung up.