At this distance the bullet is totally unpredictable. With a centerfire round say the transonic/destabilized range is 1050 to 1125 yards. With centerfire, the transition durring transonic flight causes the bullet to destabilize and to do unpredictable things hence the loss of accuracy. That's a hell of a question, i'd think you'd almost have to shoot inside a 200 yard weightless vaccuum to get a accurate measurement time to call MYTHBUSTERS supersonic at a set distance then measure the groups to come up with a SWAG of the "veering", but that got far fetched also. I have a formula somewhere that "for every inch of barrel lost, using the same ammo, fps are reduced by _#_fps" that i thought may be useful by running those numbers vs. I thought about comparing group size of hyper velocity rounds that stay supersonic at a certain distance, then find out where hv or sv rounds go sub sonic, and see what the difference is, but i don't believe the regular opening of the group is relative, so i scrapped them ideas. the biggest speed bump being as the group opens up as distance is increased, which is negated all my other SWAGs. I came up with a bunch of theories, however the end results came up with too many variables to be even a "scientific wild ass guess" (SWAG). how to do that i don't have the foggiest clue. Of course i could be completely wrong and the amount of wobble is a consistant thing that can be may even be one of those things where you hafta somehow take out gravity (bullet drop) as a factor, to correctly predict the amount of "veering" as it's own entity, then compensate for drop. I'm not sure if it can actually be predicted as once it starts to destabilize and wobble, it may end up going in any direction (up, down, left, right)as it starts to wiggle through the air, plus i don't think a ballistic calculator anywhere would or could predict destabilization. If i understand correctly what you are asking, is it how much a bullet would "veer" off course once it goes sub sonic? That's an interesting question, and the data ricsmith put up would be useful, though i think it would be better with a 0 mph wind entered, and adjust from that baseline. The bullet drops below the speed of sound on the trajectory (1119.37 fps) at: 39 yardsĪltitude: 235 Feet with a Standard Atmospheric Model. The Firing Point speed of sound is: 1119.36 fps Wind Components are (Miles per Hour): DownRange: 0.0 Cross Range: 5.0 Vertical: 0.0 Wind Direction is: 3.0 o'clock and a Wind Velocity of: 5.0 Miles per hour Velocity Boundaries (Feet per Second) of: 1000 1000 1000 1000 if you get any info on any of this please post it. I was looking at trying the 200 yard also, I have shoot a lot of 100 yard matches with the but the 200 is somthing i would like to try, I use a win 52D with globe sights and am looking a getting scope mounts for it and trying something new. I added wind just to see what it would do also. I did this with the sierra 16 program for the cci round.
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