An SCR will stay on as long as DC current is applied, so if you're triggering three coils then by the time the last one fires won't they all be engaged?
Is this not inefficent?
The way I read it, the 3 SCR's, one for each capacitor bank, once fired will discharge their respective capacitor into their own coil.
So they will switch off, once their charge is dumped into the coil.
Any idea what sort of range you can achieve with this and weight of shot.?