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Formula for what? The unit is ft*s, that doesn't make sense.

That's completely wrong. Drag force is independent of mass, therefore it cannot cancel out. Wind drift depends on lag time. With a higher mass lag time becomes smaller, provided all other variables held constant! The problem is, that you can't hold all other variables constant, but mostly a...

It's correct!

It's 2800 €.

Michael Courtney Sorry, for OffTopic, but did you get my PM?

So you shoot one of your cartridges and get, say 800 m/s at the muzzle and 700 m/s after 100 yards. The calculated drag coefficient is allocated to the average velocity of 750 m/s. Then you shoot a cartridge with a lesser charge and get for example 770 m/s at the muzzle and 730 m/s after 50...

Quote: "The drag coefficients at different Mach numbers for the complete 100 yard interval were used to establish the curve of drag coefficient vs. Mach number." What do you mean with "complete 100 yard interval"?

Actually you can defend yourself with a gun or a knive, that's legal. But you have to do it in a proper way, you can't shoot someone, who "only" stole from you, in the back or so. But self defense is not a reason to own a gun... It's not true, that the police comes annually to ones houses to...

Re: Coriolis Effect <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: Bigwheels</div><div class="ubbcode-body">A while ago I clicked on the ? tab in FFS for Cor, & it basicly said that the azimuth dictates the elevation correction, & the Lat dictates the windage...

Re: What's your bolt gun weigh Brügger & Thomet, APR, cal. .308 barrel: Lothar Walter 24 inch, scope: Hensoldt 6-24x72 19 lbs not loaded, including muzzle brake and bipod

Re: Bullet Stability Trade-Offs It's really a trade off. There are several effects due to spin that have an influence on accuracy. For example lateral throwoff increases with higher spin. Some Bench Rest shooters even accept a small instability...

Re: Books on Ballistics That's incredible! All this work made by Don...

Re: Books on Ballistics <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: JamesBailey</div><div class="ubbcode-body"><div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: tob</div><div class="ubbcode-body">Does anyone know if the corrections...

Re: Books on Ballistics Does anyone know if the corrections have been made in the 2nd edition of McCoys "Modern Exterior Ballistics"?

Re: Canting Effect on Point of Impact Much better read: http://home.wanadoo.nl/jhogema/skeetn/ballist/kantel01/kantel1e.htm

Re: Are these Lapua numbers wrong or am I losing it? The Coriolis force is F = 2 m v x w. v x w is the cross product of the velocity of your bullet v and the angular velocity of earth w (both are vectors). Calculating the horizontal component you get 2 m v w sin(alpha) where alpha is the...

Re: Theoritical Ballistics: effect of gravity? <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: CoryT</div><div class="ubbcode-body">Air density unrelated to gravity. </div></div> That's wrong. Air density will be 30% of 1 bar, if g is 30% of Earth's gravity.

Re: Miller stability The classical gyroscopic stability criterion is s > 1. The Miller rule is an approximation to calculate s. Your values are greater than 1, so your bullets should fly stable. Ballisticians recommend stability factors between 1.5 and 2. Bench Resters prefer lower values due...

Re: Bullet stabilization and Velocity <div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: RTK</div><div class="ubbcode-body">Speaking of stability, can someone answer me this. I keep hearing that a bullet "can" go to "sleep" or stabilizes at a greater distance than...

Re: Twist rates and MV When you go from a 1:11.25 twist to 1:10 twist the muzzle velocity is 99.957% of the original value (for the Sierra MK HPBT 168 grns.) As the others already stated there is practically no change. There is one barrel length that leads to max. MV (with a given powder...