Colt made the following revolvers with an 8" barrel. Some models were available in nickel, and a few in stainless:
The Colt Python. (Including several limited production models) Stainless and nickel. .38 Special Target model, and .357 Magnum.
The Colt Trooper Mark III. Nickel only. .22LR, .22 Magnum, .357 Magnum.
The King Cobra. Stainless. .357 Magnum.
The Anaconda. Stainless. .45 Colt?? .44 Magnum.