This was an idea that I came up with a couple of days ago, I'm sure there have been many suggestions to make the catalyzer line more effective but I've not seen one like this so I thought hey why not post it and see what people think.
So basically the idea is:
Swap around the bullet types; regular shots circle the enemy, the charge detonates them.
Change the gun to only have a 1 or 2 shot clip, with a similar reload to what it has now (IIRC same as alchemers).
This would allow us to keep what is taken while stacking charges - constant movement.