WebMay 4, 2024 · At first, straight rifling was cut into the bore of a muzzleloader as a way to prolong cleaning the fowling out of the bore between shots. It was found in the 14th or 15th century that imparting a spiral on the rifling of the bore on a round ball improved it's gyroscopic stability and accuracy. WebMay 15, 2024 · The Greenhill Formula, developed in 1879 by George Greenhill, a professor of mathematics at the Royal Military Academy at Woolwich, London, is the …
Determining optimal rifle twist using the Greenhill formula.
WebNov 25, 2012 · The Greenhill formula helps with this: http://en.wikipedia.org/wiki/Barrel_twist It is only a guide and there are even more scientific ways and formulas but in general if you stay with the lighter than 55 grain bullets you would be fine in my experience. There are many to choose from as the 223 is a common … WebSep 4, 2011 · When it comes to shooting conicals, you are talking different considerations, shallower grooves, and the Greenhill formula dictates the use of even faster Rates of Twist in the rifling as the length of the bullet increases, to stabilize the bullets in air. If you like FAST ROTs, the current US military battle rifle now comes rifled with a 1:7" ROT. haschak sisters gracie
Muzzleldrs - Does rifling work with round ball? Small Arms
WebThis formula is much better than the antiquated Greenhill's formula. Stability value should be in the range of 1.3 to 2.0 to ensure bullet stability. Don Miller and Dave Brennan (editor of Precision Shooting) have also been kind enough to let me host his stability paper on my exterior ballistics bibliograpy page. WebMar 7, 2024 · Barrel twist rates are determined by using either the Greenhill or Miller formulas.. Generally the lighter the bullet for a given barrel the slower the twist. Velocity is not part of the equation.. Best examples l can think of to illustrate this principle is 223Rem. When first introduced most barrels had a 1 in 12 twist for a 55gr bullet. WebJun 2, 2015 · The Greenhill Rifling Formula is used to calculate the optimal barrel twist rate for stabilizing a bullet's flight given the bullet's diameter(D), length(L), specific gravity … haschak sisters music videos daddy says no