It is thus specified. 'Muzzle exit conditions'. And shown as such by internal ballistic charts.
Butler was an actual firearms engineer who worked for Winchester.
I just can't accept a 100 fps loss in velocity in the first yard. There is no mechanism for it.
I fully realize that drag increases with the square of the velocity, but 100 fps just cannot be so.
Butler seems to agree and as much as I respect the writings of ancient sources, my chronograph is better than anything Burrard et al had access to. Certainly Hull Cartridge has the same or better, and if they want to actually measure muzzle velocity instead of using a function (observed velocity) or a simple SWAG correction (+100) to calculate it they are quite capable of doing so.
I would thus expect to be able to measure the advertized velocity on my little chronograph here, and I'd expect it to be pretty close to what they claim for 'velocity'. Certainly within 30 fps or so, it is thus with Eley and I can't imagine Hull letting Eley get away with any BS to competitive advantage.
Last edited by Shotgunjones; 02/18/14 09:55 PM.
