Some Colt Walker info for you
The Walker Colt followed the first successful Colt Revolver, the Paterson model produced between 1836-42. The Republic of Texas was the major purchaser of the early revolver and Samuel Walker became familiar with it during his service as a Texas Ranger. In 1847, Walker was engaged in the Mexican-American War as a captain in the United States Mounted Rifles (USMR- colloquially, but inaccurately, called "Dragoons.") He approached Samuel Colt requesting a large revolver to replace the single shot Aston Johnson holster pistols in use. The 44-.45 caliber revolver would be carried in saddle mounted holsters and would be large enough to dispatch horses as well as enemy soldiers. The Walker Colt was almost sixteen inches long and weighed 4 pounds nine ounces. The initial contract called for 1,000 of the revolvers and accouterments. Colt commissioned Eli Whitney Junior to fill the contract and produced an extra 100 revolvers for private sales and promotional gifts. The Walker Colt was used in the Mexican-American War and on the Texas frontier.
Problems with the Walker included its very large size, ruptured cylinders attributed to primitive metallurgy or (more likely) loading the original picket bullets backwards into the chambers and, an inadequate loading lever catch that often allowed the loading lever to drop during recoil, preventing fast follow-up shots. Period-correct fixes for this often included placing a rawhide loop around both the barrel and loading lever, to prevent the loading lever from dropping under recoil and locking the action.
Subsequent contracts beginning in 1848 followed, for what is today known among collectors as the 1st Dragoon, 2nd Dragoon, and 3rd Colt Dragoon Revolver models that were all based on the Walker Colt, enabling a rapid evolution of the basic revolver design. These improvements included shorter chambers, typically loaded only to 50 grains instead of 60 grains, thereby reducing the occurrence of ruptured cylinders, and the addition of a positive catch at the end of the loading lever to prevent the dropping of the loading lever under recoil.
The Walker Colt was quite powerful, with modern replicas firing modern FFFg blackpowder producing energy levels in excess of 500 foot pounds with both picket bullets and 0.454 inch diameter (141 grain) round ball bullets. The black powder Walker Colt is regarded as the most powerful commercially-manufactured repeating handgun from 1847 until the introduction of the .357 Magnum in 1935, and has a muzzle energy nearly exactly the same as a 4-inch barreled handgun firing a .357 Magnum. The Walker Colt has long maintained a unique position and mystique among handgun users, and its name is often used as a common expression of any overly-large generic handgun example.
Medical officer, John "R.I.P" Ford took a special interest in the Walkers when they arrived at Vera Cruz. He obtained two examples for himself and is the primary source for information about their performance during the war and afterward. His observation that the revolver would carry as far and strike with the same or greater force than the 54 caliber Mississippi Rifle seems to have been based on a single observation of a Mexican soldier hit at a distance of well over one hundred yards. The Walker, like most succeeding martial pistols and revolvers was a practical weapon out to about fifty yards.