Don't forget the forcing cone. It brings the bore down to .410. And then there's the choke, which necks it down even more.....
The .45 Colt has a .454" bullet. That's a difference of 44 thous. That's twice the difference in size between a .223 and a .243, and you'd never consider trying to send a 6mm bullet down a .223 bore!!!
The .45/.410s, they have an honest-go-God rifled .454 bore (and a whole lot of freebore leading up to the rifling when you are shooting .45 Colt), and then you stick that choke on the end to stop the wad from spinning and choke it down into a decent pattern as it exits the bore. Think of it as "overboring" like people sometimes pay a lot of money for.
Honestly, with everything but the Raging Judge Magnum only being rated for standard pressure .45 Colt, and the greater muzzle energy you get from the Brenneke slugs, I think that about the only reason to own a .45/.410 is so you can have a pistol-sized .410 without it being classified as an AOW and registered with our friends at the BATFE.
Last edited by Mr. Polecat; 10/01/18 07:53 PM.
