M1 .30 carbine vs .45 carbine

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22/22mag

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Have read that the .30 carbine was more effective then the .45 cal pistol , would this be apply if the .45 cal is shot out of a carbine type rifle such as the Bretta storm or Mech Tech at 50/100yds using 185 + P .45cal?
 
I think most of the combat experience with .45 ACP long guns is with the Thompson and M-3 grease gun. You don’t get much increase in velocity in the .45 ACP with a carbine length barrel. In comparing the carbine and .45 ACP, hard numbers are difficult, opinions are easy. That being the case, IMO .45 ACP long guns are probably more effective inside 50 yds., while the M-1 Carbine is probably more effective beyond 50 yds. to its max range of perhaps 200 yds.
Either is enhanced with expanding bullets. The carbine, according to Jim Cirillo, is particularly enhanced with expanding ammo and becomes more effective than the shotgun for police work.
 
.45acp out of a carbine won't even compare the .30 carbine. You are lucky to get an extra 100fps from the mech-tech kit and still leave you with a bullet travelling 500fps slower from the barrel. This is after all why m1 carbine was picked to replace the .45 acp round for support troops in ww2 for the carbine in the first place.
 
.30 carbine M1 is 110gr bullet at 1950 fps for 930 ft/lb m.e.

Velocity of 230 gr .45ACP from pistol is listed at 830 fps. 351 ft/lbs m.e.
From a 16.5 barrel the velocity is about 950 fps. 461 ft/lbs me
Not a dramatic increase.

You want drama, .357 Mag from a carbine gains about 500 fps
over .357 from a standard revolver. Some .357 loads from a
carbine length barrel reach 1800 to 2000 fps. and muzzle energy
can reach 1200 ft/lbs.
 
.30 Carbine is much faster and flatter shooting out of a rifle than a .45 ACP carbine. So, even if due to hypothetical bullet designs, stopping power for the two rounds was equivalent, the .30 Carbine is going to have the advantage of making hits at longer ranger than .45 ACP.

For example, I have a Marlin Camp 45 and an Underwood M-1. When shooting the Marlin at 50 yards there is a perceptable lag between the time I pull the trigger and the sound of the bullet hitting the berm. There is no such lag with the .30 Carbine because the velocity of the .30 Carbine round is roughly twice that of the .45 ACP even when the latter is fired from a rifle.

As a civilian rather than a GI, I have the option of using expanding bullets in my defensive arms. In this case the .30 Carbine still retains an advantage IMO, because a 110 grain JSP at about 1900 FPS MV is going to do more damage than a .45 JHP at about 950 FPS MV, especially if the range gets stretched beyond 25 yards. But even with Ball, I'd take one of my M-1 Carbines over my Marlin, an M-3 or a Thompson if TSHTF. I feel more confident in hitting my target with a Carbine if the range gets past 50 - 75 yards.
 
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