"-static" has always seemed out of place in this expression to me, too. Also, it has always seemed to me that knowing what's going-on is far more important (more useful) than just knowing which term to use. This process in down-range ballistics has been an item of study for me since the early 1950s, but I didn't gain on it until sheer luck had me studying physics (1956) with a professor who happened to be a ballistician and took a special interest in a student who was curious about ballistics.
The process that we're talking about here is a dynamic application of simple hydraulic pressure -- an incompressible fluid subjected to a given pressure transmits that pressure, essentially undiminished, to all surfaces of the fluid -- just as in a hydraulic jack or lift, except dynamically rather than statically when a fast bullet applies the pressure.
This is the principle that makes hydraulic systems work -- a relatively small force applied to a body of fluid by a very small ram becomes a very large force by the exertion of the same pressure over the larger area of the work ram. In a hydraulic system, the trade-off is in the movement of the two rams -- the small ram applying the pressure must move farther to move the larger ram slightly. (The fluid, being incompressible, remains the same in volume throughout.)
The pressure also remains the same throughout. A small ram applies a small pressure with its small area of application, and this same small pressure exerted over the much larger area of the work ram exerts a correspondingly larger force.
A pressure of ten pounds per square inch, for example, takes an effort of only ten pounds to apply it to a container of fluid with a small ram with an application area of only one square inch -- but it becomes a force of a thousand pounds when the fluid transmits it to a larger ram with an area of a hundred square inches (1 sq in. � 10 lb/sq in. = 10 lb for the small ram; 100 sq in. � 10 lb/sq in. = 1,000 lb for the large ram). A bullet smaller in diameter is a smaller application ram than a bullet of a larger caliber. Spin has nothing to do with how the bullet applies its force to the body of fluid.
The hydraulic system relies on containment -- the fluid must not move except to apply force to the work ram. A can of Pepsi or the body of a deer does not contain its fluid with the strength of a cast-iron hydraulic jack -- and the small ram (bullet) applies its pressure and movement virtually instantaneously -- so the fluid goes in all directions more or less equally, tearing its way free as it goes.
... no matter what you choose to call it.
