I am considering the HP carbines. Which would you buy, and why? The calibers don't matter to me as I own something in all three. I am talking SHTF. What's the differences in the range between the calibers. How do the Promags do? I have some in 9mm for my Glock. They work great since I replaced the wimpy Promag Spring with some 5%+ Wolff brand springs. BTW will the 15rd Promag fit my JHP45? LET THE FRAY BEGIN!
As we all know, one of the major advantages of a carbine is being able to have it chambered in a pistol caliber, permitting you to operate a long gun and a sidearm on one type of ammo. For most people, I'd say 9mm or 45 acp would make sense for SHTF. In rifle-caliber carbines the spread gets bigger but I'd opine that 556, 762x39, and 308 would be the best choices, based on both capability and likely availability.
Last 3 aren't given choices.. 9mm has the promags IF you can get them to work properly. Lighter weight and bit more distance than a 45. Or whichever one you can go down to wal Mart or the lgs and buy the most ammo for given price and availability.
If I was building a SHTF carbine it would be the 45 acp. I like 9mm better but with the 45 you can use 1911 drum mags. Also this is a personal thing but I would either reamer the chamber for 460 or just load 45 super brass to 460 specs. The upside to reaming would be if you find some but vary unlikely. 460 Rowland ammo also has the most power in case u need to kill a beer or whatever
But with it being a SHTF gun, it doesn't matter what stores had in stock, it will matter what you can scavenge or trade for...
I will stick with the 45 for several reasons. One, with ball ammo it is a bit more effective than 9 mm or 40 short and wimpy. Two, I already own the 4595 and a 45 pistol so I have ammo. Three, it's a 45 nuff said.
I guess since I have more 9mm HP Carbines than the others, I vote 9mm. If I would need more power than that, I''ll have to step up to a rifle!
Lucky for us though, the gubment letter agencies loaded up on .40........... Should be lots of it around in a true shtf.
I say go with the 9mm if that is what your pistols are in. If you have .40 pistols, get a .40. The .40 would be the better round. Either way, get the simplest reloading kit you can for it & 8# of powder.