Using Greenhill?

[Good Cheer]

Does anyone here use the Greenhill formula in choosing their muzzleloading boolits?

[BLAHUT]

I have used this Greenhill Thorium to get an idea of where to begin, it just gives a general area/idea of bullet length and weight to start, with a given twist rate.

[charlie b]

Keep in mind the Greenhill formula was derived for a muzzle vel of ~2800fps. It usually works ok if you are well above speed of sound. FWIW, the bullet shape used was a 'football' contour.

[Chill Wills]

I believe the Greenhill formula was developed for cannon and artillery projectiles. I've had better real life fit with my bullets and twist choices changing the constant. At our slower velocities, at C of 135 rather than 150 insures more stability. M. Rix

[indian joe]

Does anyone here use the Greenhill formula in choosing their muzzleloading boolits?

I only use round ones in my frontloaders

[indian joe]

I believe the Greenhill formula was developed for cannon and artillery projectiles. I've had better real life fit with my bullets and twist choices changing the constant. At our slower velocities, at C of 135 rather than 150 insures more stability. M. Rix

thanks for that little tidbit - number goes in my file.............

[charlie b]

The full set of equations were used for artillery. The shortened versions by Greenhill and Miller were done for us 'common' folks using small arms