Walker Cartridge Conversion

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Just finished (except for the front sight) converting an Armi San Marcos Walker reproduction to fire cartridges. The barrel is cut and re-crowned at 3-1/2" but it still weighs 3-1/2 pounds. The gun is shown with a Richard-Mason conversion for size comparison-
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Yeah, the Walker is a big gun. Seems like it should have a big cartridge, right? This one is set up to fire .44-50/200. This is a .452 Heel-base bullet loaded into modified .44 Supermag brass. This will hold 50 grains of black powder pretty handily, but I am going to be focused on smokeless loads. If I've done my math right I should be able to safely load a 200gr. bullet up to 1150-1200fps. from the 3-1/2" barrel for around 600 ft/lbs at the muzzle... but I am going to work up to that mighty carefully...

Waiting on brass and dies, but in the meantime I can shoot .44 Colt (HB) from it just fine.
 
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That's pretty wild. The slab sided barrel block makes for a unique look. I bet it's a hoot and a half to shoot.

What kind of velocity do you think you'd have gotten from a full length barrel?
 
That's pretty wild. The slab sided barrel block makes for a unique look. I bet it's a hoot and a half to shoot.

What kind of velocity do you think you'd have gotten from a full length barrel?

Hard to say for sure- Walker hot-rodding is a pretty esoteric field! :) One fellow loaded loaded 60gr. of black powder in a .460 S&W case behind a 173gr. ball and got 1350 fps. Another says he got that with smokeless behind a 200gr. bullet. That seems pretty reasonable. Honestly I'm not sure how hard I want to push this; I'm not sure how good of materials I am working with here. I'm not worried about blowing up the cylinder so much as I am stretching the frame and accelerated wear.

I have to remind myself that the original Walkers were mostly wrought iron and case-hardened steel, and for the most part they had no problem with round ball over 60gr. of BP. This gun is at least made of steel, with crucial components like the arbor heat-treated. It ought to be significantly more durable as long as I stay within the limits of the originals.
 
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