Who'd be interested in this? Thumper Carbine!

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A friend that I shoot with is the consumate tinkerer. We were both shooting Win. 94s and we came to the conclusion that a little carbine like my Trapper in .357 or .44 but with a semi-auto action would be a neat little beast. My friend has now purchased a few older 94s to see if it can be done.:rolleyes: The idea of a small tube fed semi-auto bullet launcher is interesting, but doesn't look doable.
 
No, no, no, Rabbit;
The Cooper Thumper is NOT to be selective fire. It is to be a semiauto submachine gun replacement with good enough sights and trigger for you to put one big bullet on an enemy at reasonable range and move along.

444
I had thought of the Socom (and Beowulf) but decided not to stir the pot. They are rifle rounds not Thumper cartridges.

Night,
Ammo availability is your problem. High capacity magazines for rimmed revolver ammo would be a considerable challenge. There aren't many rimless ones except the .50 AE, .45 Win Mag, and a chance of resurecting the .44 Automag. It is unrealistic to expect a new cartridge devised for the project to be immediately available in plinking quantitiy and price.
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Who says it has to be rimless? While the difficulties of box magazine feed with a rimmed cartridge are legion when used in a design originally developed for rimless cartridges, if meant for a rimmed number from the outset, there shouldn't be a problem, though one possible direction does suggest a rimless case as being worth investigating.

But the magazine feed ststems of the .38 special Hill submachinegun or the Calico M900 should be considered, as should the dual feed tubes of Tony Neophytou's Neostead shotgun design also offer an interesting possibility.

An interesting starting place? The new S&W .500 magnum revolver cartridge. And the rim diameter is close enough for possible use of a semiauto Saiga .410 Kalishnikov shotgun receiver, fed from a box magazine....

saiga410s-sm.jpg
 
A friend that I shoot with is the consumate tinkerer. We were both shooting Win. 94s and we came to the conclusion that a little carbine like my Trapper in .357 or .44 but with a semi-auto action would be a neat little beast. My friend has now purchased a few older 94s to see if it can be done. The idea of a small tube fed semi-auto bullet launcher is interesting, but doesn't look doable.
Click to expand...

You and your friend might find it interesting to note that the bolt face diameter of a Winchester 94 in .30-30 is very close to that of the new rimless 6,8mm SOCOM rifle/carbine cartridge, much shorter than the .30-30, but not suitable with a pointed military bullet in the tubular feed magazine of the Winchester.

But opening up the neck of that 6,8x43 mm cartridge to a flat-pointed heavy 10mm bullet or so might just work as a very credible thumper cartridge on the lighter side of the thumper spectrum. Incidentally, a 7,62x39mm Kalishnikov, opened up to 10mm also works, though a bit short to develop the velocity required to keep the trajectory reasonably flat.

But possibilities based on the '94 action abound....
 
What about starting with the Ruger 99/44.

I do not know much about the platform but if it is as easy to manipulate as the 10/22 you might have a good starting point for a .44mag thumper.
 
I do not know much about the platform but if it is as easy to manipulate as the 10/22 you might have a good starting point for a .44mag thumper.
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I'm sort of coming around to the idea that the new S&W .500 revolver cartridge might be an interesting chambering for *project thumper.* The rim isn't necessarily as problematic as it might seem, as per the older Ruger .44 Magnum Deerslayer and the current .44 carbine. Or the ols .44 Auto Mag and Desert Eagle handguns, so far as that goes.

My tendency is to build up a singleshot first- maybe a TC Contender or Encore- to determine the most suitable barrel length/bullet weights and some groundwork ballistics. Then from there the project can be expanded if no dead ends are encountered.
 
I happen to have one in .44 Auto Mag. I found this thread trying to find some info about it.
IMG_0175.jpg
 
Pretty cool and no one can say you didn't use the search function. Welcome aboard.
 
Very cool indeed. I've been tinkering with this idea for about a year now since Ohio opened rifles up for deer season but only in certain straight walled cartridges.
 
Outstanding necro resurrection! Got to be a new record.

Just in time for Halloween. :evil:

M
 
For some modern pertinent info the original topic (though, why bother?), there is a wildcat called 510 Reedwhacker that mimics med/high 45-70 which fits inside AR and AK mags. It's made by cutting down WSM brass to the shoulder, and sizing for a fifty-cal bullet (or something close to that). Open up the old AR15 bolt head past the non-structural 'fence' into the lugs slightly, and get ready to play with the gas system a lot to dial it in. I've seen video of both an AR and AK running it, though (the AR looked like a bit of a handful, the AK blew off the dust cover due to an overgassed test configuration at the time but functioned fine without it) so a semi-auto in something similar to 50-90 ballistics is certainly possible.

50%20Thumper.jpg

You'd have to single-load the full BMG-bullet configuration, of course ;)

Another idea for a shorter-range thumper might be a high-velocity 45caliber pistol cartridge, like the Rowland or Corbon or whatever. My HK mutt-build*; ultimately meant for standard subsonic 45acp, but presently still 'timed' by its rollers for full-on 7.62 NATO, might be an interesting test bed for hot loads during the tuning process :cool:

TCB

*pure-bred mongrel, of MP5, HK33, CETME, USC, and AR15 lineage :D
 

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It's a Plainfield M1 carbine with a conversion to .44 Auto Mag From what i was told, The serial number dates the action to 1965 and the lowest known non lettered serial number for Plainfield is 109, this one trumps that at 72. So i was just trying to do some more research and found this thread... Nice shooting gun
 
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merkur said:
It's a Plainfield M1 carbine with a conversion to .44 Auto Mag From what i was told, The serial number dates the action to 1965 and the lowest known non lettered serial number for Plainfield is 109, this one trumps that at 72. So i was just trying to do some more research and found this thread... Nice shooting gun
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Wow. It is the most beautiful M1 Carbine I recall ever seeing. Very nice. :cool:
 
I like the idea, though I would need one that's California legal and personally, I prefer to sacrifice a pistol grip stock and threaded barrel in exchange for not having to have a neuter button.

As for caliber selection, I think it would be wise to stick with rounds that are reasonably commercially available.

If you can get rimmed cartridges to work in a semi-auto, a .44 mag or .454 cas. version would rock. I would even purchase such a carbine if it fed from a fixed tube mag (I'm imagining a levergun that you don't have to lever).

I think a 10mm auto version that could take common pistol mags would have a decent niche following

While not a big bore, I have a soft spot for the .35 Remington (a round invented for use in semi-autos). I think a modern semi auto in that round rocking a 20-30 round mag would be a formidably weapon for a variety of purposes at moderate distances.
 
H&K produced a 10mm MP5 (called the MP10 amazingly enough) for the FBI for a while during their time with the 10mm. It was a great gun. In regard to this thread in specific, it's a little smaller in diameter and light on power, but a 10mm in a 9.5lb full auto gun was a match made in heaven as far as I was concerned.

-Jenrick
 
"If you can get rimmed cartridges to work in a semi-auto, a .44 mag..."
There are lots of folks who've kludged DEagle mags onto various milsurp sporter rifles successfully, and I'm sure there's a magblock for them for ARs somewhere as well. Semi-auto 45 Winchester or Rowland could use off-the-shelf AR10 bolts/extensions, though ;)

TCB
 
-Semiautomatic Carbine
-All Steel Folding Stock with rubber recoil pad (assuming AWB sunset)
-16.1" Barrel, with threaded, removable flashhider (assuming AWB sunset)
-Ghost Ring Sights
-20 round detachable box magazines, all steel (assuming AWB sunset)
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I didn't realize how old this thread was until I read this.

This is really a cool bump though.
 
I believe Mr Nightcrawler is Mike Kupari (public knowledge, I dont believe I'm outing any top secret info. Its in Wikipedia in any event). He had a short story series of posts here Welcome back Mr Nightcrawler, which ended up in the Dead Six series I believe, written in collaboration with Larry Correia.


Larry Correia's has a number of books out, they are long on action and very good on accurate gun geekery details.

I got started on his books a year or two ago and have enjoyed all Ive read, which is a majority.

http://monsterhunternation.com/

https://en.wikipedia.org/wiki/Larry_Correia
 
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