It makes sense, sort of, but they'd need a special rule for it.
As an example, when they were designing the SR71 Blackbird, it was originally intended to be a post-nuclear strike 'take out what we missed before it launches' aircraft. Then some genius realized that you could get missiles up to roughly Mach 7, when they were starting over Mach 3. They ran some numbers, and realized that they didn't even need a nuclear warhead. 500kg @ 7000kph yields roughly 75kilotons, and orbital strikes come in at over Mach 15. Do you guys remember one of the old X-Files episodes, with an ortillery/SDI satellite firing on a ground target? IIRC, that was a slug the size of a hockey puck, and it devastated an area the size of a football field. Scale that up to a bombardment cannon-sized shell (even if it is a subcaliber dart), and you're looking at massive desrtuction in a wide area.
I'd suggest a small blast template of roughly 3BP MW, TK(d3). Each successful hit causes a loss of d3 DC. Makes it a pretty dedicated WE-killer, but still fairly effective against troops/vehicles, and something resembling realistic for hard ordnance coming in from orbit, compared to a lance strike. It'd be an either/or choice, though. 2BP Orbital plus the 3BP small template, or the full 5(?)BP orbital.
Actually, that wouldn't really need a special rule, just a tweak to how the Bombardment Cannons work. Hmmmmmmmm...
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