RE: Knight KP 1 Muzzleloader/Rifle
"Shooting Times" magazine just did an article on it for the December 2007 issue. There is also a nice articleaboutsingle shot's in the same issue.
The removable trigger would be a nice feature for muzzleloading, but it may be some time before accessories and a wide variety of add on barrels will be issued. The article says, "The KP1 will initially be offered in .17HMR, .22LR, .223, .243, .270, .30-06, .300Win Mag, .45-70, and .50 cal muzzleloader".
I'm surprized that 7mm-08 or .280 didn't make their list, but if the KP1 sells, I'm sure other barrel companies will offer their own fitted barrels.