|Originally Posted By Keith_J:
The problem with the .22-.250 is the extreme body taper on the case. This was a hold-over from the parent .250 Savage (AKA .250-3000 Savage). Back in 1915, that was the classical view and sadly, it persists today among the non-technical field. It does NOT make extraction easier (all revolver rounds have completely straight cases, this prevents binding) and in fact, was a problem in using modern propellants in the .250 Savage. Parker Ackley was first to recognize this, making the "Ackley Improved" modification to this cartridge which HELPED extraction in the venerable Savage 99 chambered in the cartridge.
Now, to the application. Since the .22-.250 is guided by the smaller diameter .22 caliber bullet, taper of the body isn't necessary for feeding. And taper here will prove to be a problem in magazine function, causing the stacked rounds to curve.
Now squeezing this round into the standard AR15 magazine well is a stretch but there have been magazines designed for OALs in the 2.40" range. Making a 20 round into a 8 round .22-.250 Ackley Improved would have definite application. Like shooting 75 grain Swifts at 3400 FPS
Now a .22-250AI, that is what I am talking about!!