In their catalog
None. While there are firearms made to shoot .45 Colt AND .410 shotshells, they are designed and made to do that. A regular .410 shotgun is NOT made to do that safely.
The 410 Shotgun is really .410 Caliber. Unlike all other sizes of shotgun, (10,12,16,20,28gauge), the 410 is measured in caliber. I believe it works out to something like 36 gauge. So the 410 shotgun is .41 Caliber
There have been several handguns made that fire .410 shotgun shells- most recently the Taurus Judge. By the way, .410 is actually a caliber of shotgun, not a gauge. A .410 shotshell is about 67 gauge- but no one uses that designation.
Colt has never made a 45/410 pistol
A 410 shotgun is basically a 41 caliber smoothbore. A 45 caliber round may fit in the chamber, but the bullet is too big. Don't do it.
THE GUN IS A .44 CALIBER SHOTGUN, NOT A .410 CALIBER. I HAVE BEEN TOLD THAT IT MAY HANDLE VERY SHORT .410 CALIBER SHOT SHELLS OF LOW POWER BUT, IT COULD RISKY.
Yes, it is a 410/45LC combo derringer, and runs about $80-$100.
NO!!
NO. Unlike the Judge and similar dual caliber handguns, the snake charmer was made for .410 shells ONLY. Bore diameter is too small. It MAY fire a time or two, but the pressures will be greater than the gun was designed for. Eventually it will fail, hurting you.
chamber length
Yes.
Hell no. .410 is not a gauge it is a caliber. True gauge is a measurement of the number of lead balls of bore diameter that constitute a pound. The .243 bullet is a lot smaller than the diameter of a .410 barrel. There are some .410's that can shoot 45 colts but not all can.