Who loads these for them?What componets do they use?What brand would you buy?

Kynoch is loaded by Kynoch in Mildenhall, England. Seems to be good consistent ammo. In the larger bores, bullets are Woodleigh softs and solids. They buy their brass, primarily from Horneber, and some from Bell in the past. A few calibers are Bertram.

Westley Richards ammo is loaded by Wolfgang Romey in Germany. I treat it the same as the A-Square stuff. If you have some, pull the bullets, dispose of the powder, and use the cases for handloads. I've shot it in the past but will never do so again.
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"Serious rifles have two barrels, everything else just burns gunpowder."