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All / any of the English gun-makers who made double rifles around the turn of the century produced simply outstanding examples of the firearm maker's arts: Rigby, Holland and Holland, Purdy, Jeffery, and maybe a couple of others. Their products were simply the best they could be made with no thought to limits such as expense, manufacturing time, etc. They were, at least the large caliber (.400 and larger, 'dangerous game' calibers) almost always custom fitted to the purchaser, and included all the accouterments as well as a beautiful leather, wood and metal case.
They were almost all double rifles, exactly like a double- barreled shotgun but a true rifle, and often in impressively large sizes. Meant for the most dangerous game on the planet, and to be used and depended on where there were no spare parts, gunsmiths or support of any kind, they were as rugged as a brick in addition to being outstanding examples of precision and beauty. Most Americans do not even recognize them and thing they are a 'fat' double- barreled shotgun because they were almost never used in the US, where we always tended to prefer repeating firearms but if anyone ever gets a chance to see one, by all means do take the time to examine and enjoy it for a few moments.
BTW: because these are true rifles, they are actually very accurate. But the two bores do not share an axis and so are very slightly angled toward each other at the muzzle so the points of impact of each barrel crosses at a specified distance (and of course with a specified projectile, loading, etc.). The men who aligned these firearms were called regulators, and they would spend days fitting each rifle and shooting it from a bench to properly align the sights and both barrels. In the heavier calibers, this was truly punishing work. I read a story about one gentleman who suffered all sorts of physical damage from a career of doing this very thing on some of the most powerful rifles in the world. The size and power of these rifles was truly impressive; they were usually weighted with lead to make them 'sort of' manageable to shoot, and required 'gun bearers' to tote them around all day (multiple people, taking turns).
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Brian
Can't forget Holland and Holland. Arn't they the Roles Royce of firearms and made in London? I've seen some H&H guns but have never touched one.