POLAND_SPUD wrote:well it's difficult to get the idea of power if all you've got is a bunch of numbers from GGDT...
something like 30J or 150m/s doesn't really tell you much
It does if you have some idea of airguns and firearms, it's true that once you're dealing with high energy figures because of projectiles much larger than bullets at relatively slow speed it doesn't really make for a useful comparison but for smaller calibre launchers you get a pretty good idea. For example, a 15J air rifle is good enough for rabbit hunting at 50 yards if you can hit the thing. Not advocating hunting for spudguns, just giving an example of power.
you know, price wouldn't be a problem on a gun that fires one round per minute but as ROF increases this starts to be a major problem
Very true, personally ammunition cost and availability is a major factor when it comes to deciding the calibre of an auto project.