Anyone verify bullet stability calculator results?
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Anyone verify bullet stability calculator results?
search for the above; jbm is one site, there are others
Data says a 16 twist stabilizes every 45 at 500 fps.
Not sure it's valid
Thoughts?
Thanks
Merry Christmas
Data says a 16 twist stabilizes every 45 at 500 fps.
Not sure it's valid
Thoughts?
Thanks
Merry Christmas
Dan Webb likes this post
Re: Anyone verify bullet stability calculator results?
Based on all the results forum members including myself have gotten with the 13 twist, that low fps # seems suspect. Forgive me for asking a stupid question (not an engineer) but is there a perfect correlation between stability and accuracy (group size)?
SmokinNJokin- Posts : 851
Join date : 2015-07-27
Location : Wisconsin Rapids
Re: Anyone verify bullet stability calculator results?
Not precisely. Rifle shooters have found that “overspun” bullets loose a bit of accuracy, but the amount is hidden (or can be) within the variances in accuracy between barrels. That said, pistol bullets have aerodynamic issues that spin can only mitigate a bit. Stability is a method of eliminating the overturning moment of the difference between the center of aerodynamic pressure and the center of gravity. Pistol bullets, particularly those used in Bullseye, aren’t particularly aerodynamic nor are their center of pressure and center of mass necessarily in the best of locations.SmokinNJokin wrote:Based on all the results forum members including myself have gotten with the 13 twist, that low fps # seems suspect. Forgive me for asking a stupid question (not an engineer) but is there a perfect correlation between stability and accuracy (group size)?
Wobbley- Admin
- Posts : 4782
Join date : 2015-02-12
lakemurrayman and Dan Webb like this post
Re: Anyone verify bullet stability calculator results?
38 HBWC coming out marginally stable so maybe it's right.
Re: Anyone verify bullet stability calculator results?
The old Greenhill formula suggests an HG 130 only needs a 54" twist ;-)
And that's regardless of velocity. Of course, the length to diameter ratio isn't much different than a round ball ...
And that's regardless of velocity. Of course, the length to diameter ratio isn't much different than a round ball ...
WesG- Posts : 712
Join date : 2018-09-21
Location : Cedar Park, TX - N CA
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