Charlie said:
Pistol caliber carbine would be OK if were a 10mm! My G20 mag with the Arredondo extension (total of 20 rds.) would run great out of a 16 or 18 inch barrel. Possibly run over 2000 fps out of a barrel that long.
The AnarchAngel web site shows the 10mm starting a 200 gr bullet at 1778 fps out of a 16" barrel, for 1404 ft lbs of energy. Not bad at all! Such a gun with a folding or collapsing stock would come fairly close to the "Thumper" concept Jeff Cooper outlined in "To Ride, Shoot Straight, and Speak the Truth."
I'm not sure the Thumper concept hasn't been obsoleted by the widespread use of the M4, but some people might like the heavy/slow bullet compared to the light/fast 5.56mm/.223, even if the 10mm trajectory would be rather...curvaceous.
It would okay for home defense, albeit with probably a lot more penetration in building materials than .223
Such a gun would certainly be better than a 9mm or .40 for hunting, though I don't see many people using lever-action .357s for hunting, and that gun is in the same ballpark power-wise. I think a quasi-military-looking carbine would be a tough sell to hunters.
It would be of little use in a three-gun match, since it would kick harder than .223 with a more looping trajectory.
I don't know how well 10mm works on vehicles, but handgun rounds in general do poorly against cars. You really need a .30 caliber rifle for a "truck gun."
I doubt cops would buy it in serious quantities. The HK MP5/10 didn't exactly set the world on fire with police departments.
10mm is rather pricey to shoot compared to .223. It would be a neat gun, but still more or less an expensive toy. Nothing wrong with cool toys, though.
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