I don't know the gun you are describing but SBS are 'traditional' game guns rather than o/u. But as you say you can shoot both with either. I think it is more to do with tradition, but the likes of me doesn't get to go on expensive shoots so I am only guessing.
The trigger on my .410 has suddenly gone really stiff. Being someone who isn't particularly good at mechanical things, would you recommend me having a fiddle myself or taking it to gun smith? Are they hard to fix? It's an Italian folding jobby.
We both know burrow baiting is safe and effective almost regardless of the formulation of the product, so that's a bit of a red herring. And as you have mentioned, least toxic first, as per earlier comment.
And you wonder why it was banned? Your first resort is for a poison in a powder form, and that powder is very difficult to control it's distribution. Crazy.
What's your choice of cartridge for dispatch? 2 1/2 or 3" ? I use the smaller one as my .410 isn't moderated and with that size it just sounds like a loud banger. And I should add the 3" cartridges seem much much louder.
That wooden box set up is really impressive Woodga. I have done similar with Fenn's for squirrels, although your workmanship looks better - is that set up with 110's?