I have serial #64344 that made it as far as Shapleighs in St Louis in 1917 and as a result carries no British proofs. It's still in 455 which makes me wonder - was there a US market for this caliber at one time? As evidenced by all the rechambering to 45 Colt it must have faded quickly, or remained as a much less popular option.

Is there any differentiation made (and by "differentiation" I mean $$$ ) between a 455 that stayed stateside rather than being sledgehammered up by our Britics friends?