Sorry, there is no 454 Casull/45 Colt convertible Bisley, stainless.
However, if Ruger makes 357 Magnum/9mm and 45 Colt/45 ACP convertibles, why not 454 Casull/45 Colt? Since they already manufacture 5-bore Bisley stainless in 454 Casull with 4-5/8" and 6-1/2" barrels, adding another cylinder for 45 Colt should be a snap.
However, if Ruger makes 357 Magnum/9mm and 45 Colt/45 ACP convertibles, why not 454 Casull/45 Colt? Since they already manufacture 5-bore Bisley stainless in 454 Casull with 4-5/8" and 6-1/2" barrels, adding another cylinder for 45 Colt should be a snap.