@ScrumbagSir, if you would consider SG rather than LG shot you could look at:
Gamebore Buffalo and Lyalvale Supergame
I use this, works!
It is a really small world . As a matter of fact , I recently acquired a box of Lyalvale Express Supergame 2 3/4 inch AAA shells and I used them quite successfully to hunt half a dozen greylag geese .
SG would be perfectly suitable for barking deer , Axis deer and ( perhaps ) even wild boar . However , when I need to employ a shotgun against the creatures pictured below ; I find that the .36 calibre diameter of LG slugs are quite difficult to surpass .