essence = purpose
dangerous game to play by the retailer if they want to keep their RFD certificate, no defence if it went to court however unlikely that may be. And both the seller and buyer or even attempting to buy are committing an offence.
I doubt it would go to court they would just revoke the RFD certificate.
Not worth the risk, just to use brass cases in a shotgun is it really? After all used plastic shotgun cases can be had for free from virtually every clay ground that use 209 primers. Any other reason for attempting to purchase them without an FAC is surly why the law is their.
Was it not the offensive weapons bill of 2019 where they tried to impose even stricter legislation on reloading components, so maybe not help them justify them in the future.