I have never done this so take what i say next with a grain of salt (so to speak).
I have seen pest control guys registering and then converting A-Cat shotguns to E-Cat. The owner obviously needs the E endoirsement and then needs to explain to the AO the reason for the change. For the guys i was talking to they were part of a DoC hunt team and culling goats from the helicopter. It was simple enough to demonstrate that to the local AO.
For guys shooting 3gun i would have thought the explaination to the AO would be pretty straight forward. Like the guys who compete in service rifle competitions. To be really competitive in service class you need an E cat semiauto. This is sufficient reason for them to be given a permit to procure (forgetting the stupid hand in thing) and therefore should be sufficient reason to convert an A-Cat to E-Cat.
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