At one time there were a lot of these for sale as used guns: often with histories of having fired one or two multiples of six rounds. Most people who own a .30 Carbine revolver will, if honest, admit that they seldom shoot it.
Virtually all carbine ammo is full power, since it is designed to function the action of a gas-operated semi-auto carbine. (The pretty much standard load is a 110-grain RN FMJ over 13 - 13.5 grains of H110.) They are flame-throwers, primarily because of the comparatively slow burning propellant. Ballistics are akin to a full power .357 Magnum.
In addition to muzzle blast, marginal accuracy, limited range (the 110-grain RN FMJ is not very efficient ballistically), and cost of ammo, most folks find extraction of fired cases difficult.
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