Breech Loading Barrels
Breech loading is awesome, it is much faster to load. I think it took me about 40 seconds to load a spud with the ramrod method, and now it takes me 5-10 seconds. Once you try breech loading, you will never go back to muzzleloaders.
Type 1: Cam Lever Coupling
This is the method I use on my spud gun.
I use Banjo fittings. You can get them at many farm equipment stores. They are used on sprayers on farm equipment (as in fertilizer, pesticides, etc.) According to the banjo website their operating pressures are 125 PSI, I believe this is not the max PSI, only an operating range, as you may already know they can hold much more pressure before failure. (a wild guess would be 300 psi max,or more?) They come in many sizes, I have seen 1" to 3", with many variations on the kinds of fittings.
www.banjocorp.com for more info. I use model 200D and 200A fittings on my gun. The pics describe the method I made the barrel. The hardest part is turning the barrel down on a lathe. You can also use a Dremel tool, but it took me around an hour and a half doing it like that.
A pic of what it looks like:
pic was not too clear, materials include: 2"MPT fitting, 1.5-2" bushing, 2" cam lever coupling, and 1.5" schedule 40 pipe.
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