UPS dropped this off at my house yesterday. George Gibbs Farquharson Action Sporting Rifle
48 bore proof (nominally .44 / 11mm). 28" barrel length. I did a chamber cast and slugged the bore this morning, and I got lucky. The chamber cast says .450 3 1/4" BPE. That means I don't have to search for .461 Gibb dies and brass, I already load the .450. I can now scratch a Farquharson off my bucket list.