The Colt [Mysterious Object]

Back in 1835, when Halley's Comet was overhead, same night those men died at the Alamo, they say Samuel Colt made a gun. A special gun. He made it for a hunter. A man like us, only on horseback. Story goes, he made thirteen bullets. This hunter used the gun a half dozen times before he disappeared, the gun along with him... Somehow Daniel got his hands on it. They say... they say this gun can kill anything.

Type   Range Modifier  Ammo  ROF   RL   Mounted Use?
Revolver      -07                   6        4      2*         Yes
Special Ability : Colt created this gun with one purpose and one purpose only to kill those creatures that would hunt god fearing folk,
In game terms any damage done by this weapon is shifted one level when determining damage
exanple : a S result becomes a L wound,etc.
A natural C result is special, if a C result is naturally rolled then the thing must make a sta ability check with a negative modifer = to the damage caused by the amount from the c result.
Failure = Instant Death to the creature
S result = damage x 4
L result = damage x 3
M result= damage x 2.5
H result = damage x 2
C result = damage x 1
That seems too powerful? well here is the kicker, without the special bullets the colt is just that a simple revolver. It is rumored that colt scattered a trove of bullets across the country when he was finished with the revolver