Would This Work?

[Peshtigo71]

    I have one of the old Mossberg .410 bolt action shotguns with a threaded choke.  Would it be possible to take a pistol barrel of appropriate caliber and thread it to fit the shotgun to shoot slugs with?  This would be similar to the rifled choke that Remington had/has.  What caliber would you guys suggest, .40, .41, .44, .45?  I was going to use brass hulls and a .40 caliber bullet so that it fits in the wad when loading, sort of like a sabot.  Maybe I've been stuck inside for the winter too long with too much time for thinking.    As always, any help with this project is greatly appreciated.

[Frank46]

I've seen this done with the handi-rifles but its a lot more involved that you may have been led to believe. In a nutshell they cut off the exsisting barrel leaving a stub about 3" long. Thread both the stub and new barrel screw together and possibly rework the extractor. That's basically it but its more involved than I described. Hope this helps. Frank

[mcwoodduck]

There is a difference between shooting a 410 in a 45 Long colt gun chambered to 410.  The shot shell will fill the 451 barrel.  Trying to cram a 451 bullet into a 410 barrel would cause some pressure spikes.   I thought of trying to load a couple of 45 colt cowboy loads into my 410 SXS thinking it would be a great brush gun.  Only to find that the gun would not close on the 45 colt rounds, thankfully or I could have hurt the gun and me. 
Also the guns made to shoot both are made to 45 colt pressures and the older marlin bolt guns are not made to the pressures.   

[gunnut69]

Guys I believe pestigo71 was inquiring about replacing the threaded on choke tube common to these old shotguns with a section of barrel from a revolver with the rifling left in place. This would give us a rifled choke tube. His caliber inquirey was refering to the pistol barrel section.. I would suggest 45 colt. Replicating the threads Mossberg used on the barrel on the internal cut of the barrel section (choke tube) may represent a bit of a challenge (I'm not a good machinist)..Remember to allow a throat area in the entrance of the new choke device to get all in with minimum interference.. Also the bullet will impart torque to the new choke tube, and depending on thread direction (and rifling twist) it may unscrew or over tighten the tube. I would consider a jamb nut to stop movement.. Let us know how this works out.. 

[Peshtigo71]

    gunnut, that is exactly what my question pertains to.  Threading a section of rifled barrel of the appropriate caliber and replacing the full choke with the rifled portion.  The full choke bore measures  .390" and the bore at the end of the barrel itself measures .415".  How long does it need to be?  Since I'm planning on reloading my own shells using a softer cast non jacketed bullet inside the wad I'm leaning towards using a .40 caliber bullet and a .41 caliber barrel.  Everything should compress enough so that the wad grips the rifling and gives me what I need without any pressure problems. I am however wide open to any suggestions or concerns that can be thought of.  This is a work in progress and the iron is not even in the fire yet.  First I have to find an appropriate section of barrel and then a machinist capable of doing what I need done.  I will keep you appraised of any developments and thanks for input.     

[gunnut69]

You might check out NumericArms parts catalog. They have a barrel section with quite a selection..