The outbreak of war with Mexico in 1846 led a suddenly revolver- hungry U.S. military to scour gun shops for remaining Colt handguns. Colonel Samuel Walker of the U.S. Mounted Rifles, a former Texas Ranger who had witnessed the power of the Paterson in the 1844 Commanche fight, traveled east to look up Sam Colt and offer some ideas for an improved version of the gun. The result was the massive, six-shot .44-caliber "Walker" Colt. Despite a disturbing tendency to blow up in a shooter's hand, the "Walker" put Colt back into the gun business for good. For the next twelve years, the terms "revolver" and "Colt" were synonymous.
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The massive Dragoon was introduced to rectify a number of defects found in the even larger Colt Walker revolver which were discovered in active service during the Mexican War. For example, the Walker was so large at four and a half poundsge at four and a half pounds that it was quite unwieldy. Additionally, a number of Walkers exploded when they were fired, no doubt causing much grief to their users. Features introduced in the Dragoon model include a slightly shorter cylinder, holding up to 50 grains of powder and a round ball (compared with 60 grains in the Walker), a slightly shorter barrel (7.5 inches versus 9 inches for the Walker), and a somewhat more positive loading lever latch designed to keep the lever from dropping down during recoil and jamming the piece. The shorter barrel and cylinder brought weight down to 4 pounds two ounces and thus made the arm slightly easier to handle. The lower powder capacity lowered chamber pressures and made the gun inherently less likely to blow up when shot. Improvements in Colt's metallurgy also helped in this regard.
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The massive Dragoon was introduced to rectify a number of defects found in the even larger Colt Walker revolver which were discovered in active service during the Mexican War. For example, the Walker was so large at four and a half poundsge at four and a half pounds that it was quite unwieldy. Additionally, a number of Walkers exploded when they were fired, no doubt causing much grief to their users. Features introduced in the Dragoon model include a slightly shorter cylinder, holding up to 50 grains of powder and a round ball (compared with 60 grains in the Walker), a slightly shorter barrel (7.5 inches versus 9 inches for the Walker), and a somewhat more positive loading lever latch designed to keep the lever from dropping down during recoil and jamming the piece. The shorter barrel and cylinder brought weight down to 4 pounds two ounces and thus made the arm slightly easier to handle. The lower powder capacity lowered chamber pressures and made the gun inherently less likely to blow up when shot. Improvements in Colt's metallurgy also helped in this regard.
http://209.85.173.104/search?q=cache:NRCmNV8sIvgJ:home.comcast.net/~dsmjd/tux/dsmjd/tech/dragoon.htm+some+percussion+walker%27s+would+blow+up+when+fired&hl=en&ct=clnk&cd=2&gl=us