Schofield Reproductions & Duplex Cartridges?
Added 2025-01-10 20:09:58 +0000 UTCYouTube link:
https://youtu.be/VenljA3Vsq4
Reproduction Schofields just don't work with bp, but maybe the old timey solution of duplex cartridges might fix that?
Let's try it!
Comments
In the case of the old timey duplexing, they were mostly looking at ameliorating the horrible corrosiveness of the original smokeless powders when combined with the corrosive primers of the day; the BP fouling left enough residue to buffer some of the corrosive f/x w/o binding up the gun. Back then, smokeless meant you had to wash out the gun *sooner* unless you lived someplace w/ very low humidity, like out West; its real advantages lay in the higher Vm it allowed and the ability to run a repeater longer before accuracy or functioning fell off.
Bruce Brodnax
2025-01-13 18:03:23 +0000 UTCYou can find the info online on duplexing, but the general rule of thumb is to use a smokeless powder w/ a burn rate slower than black [not the Bullseye shown by Karl; that's a very fast pistol powder that would cause pressure spikes unfriendly to old school firearms], use 10% of the usual BP load, and reduce the BP by the same amount. Ergo, IMR 5744 [good luck finding it! OOP], your vintage .32 S&W uses 15gr of BP, so you would use 1.5gr of the smokeless, and 13.5gr of BP. Like I said, you can find it all online; the internet is a wonderful thing!
Bruce Brodnax
2025-01-13 17:59:21 +0000 UTCFor a moment I was thinking of a VERY different kind of Duplex Cartridge
-Kris-
2025-01-12 22:02:01 +0000 UTCheck that is a BIG can of powder! how many grains is that?! just bought my first powder. wanted unique couldn't get any. I ended with titegroup for now. uhoh! uhem... handloading is NOT a german thing to begin with. but I was told NEVER mix nc and black for safety concerns. like A FEW grains of nc... few is like a full load say with a 9. sounds a lot.
Guido Schriewer
2025-01-11 18:38:00 +0000 UTCWhat a cool application of this old tech! My understanding of the mechanism at work has always been different from what you described: from reading Harry Pope and Harvey Donaldson, (neither without their reliability issues) I have always understood the mechanism not a change in BP combustion, but just that the smokeless charge at the rear would push the BP combustion products out the muzzle before they settled in the bore. That's why the smokeless generally goes at the rear not at the front or mixed.
Marlene
2025-01-11 00:56:46 +0000 UTCInteresting! So this could also be used on other modern "black powder" reproductions to reduce fouling. More complex loading, but it has benefits!
Jason
2025-01-10 21:36:35 +0000 UTCGreat information Karl . Cheers 👍🏼
A A C
2025-01-10 20:37:31 +0000 UTC
