A 300 BLK AR makes more sense in general * * *
Agree for three reasons.
First, the bullet-weight range of the .300BLK runs, generally, from 110gns to 220gns, and covers both supersonic and subsonic applications - suppressed or unsuppressed.
The .30 Carbine, while historically important, is an outdated round that has few bullet-weight variations, hasn't been vetted suppressed, and was a notoriously poor "man-stopper" on the WW2 and Korean battlefields.
Thus, apart from its "fun-time" value for casual range plinking, this cartridge has little practical use today given other options.
Second, while factory ammo for the .300 is still pricey compared to 5.56mm/.223 and 7.62/.308, two market-based influences are forcing .300 ammo prices down: (1) .300BLK ARs (complete guns), AR uppers, bolt guns, and barrels (both for re-barreling a 5.56mm AR or a .223 bolt gun) are selling extremely well, which in turn has created consumer demand for economical ammo to feed these guns - because not everyone reloads; (2) price competition in factory ammo is increasing because more and more ammo-makers are producing one or more flavors (i.e., bullet-weights) of .300BLK ammo, including particularized hunting ammo and bulk practice fodder, such as Fiocchi's 150gn FMJ-BT load.
Third, whether you're talking about new factory ammo or your own handloads, the components for making .300BLK ammo are relatively inexpensive: it's a small primer, 5.56/.223 case necked up to accept .308 bullets - and a wide range of them at that.
In other words, the component brass, bullets and primers are all cost-efficient precisely because they're so plentiful.
So, ... while it's always fun when Gramps entertains the grandkids over his morning oatmeal with war stories about how many "Commie gooks" he put down with his trusty M2 .30 carbine, chambering it in an AR today just doesn't make a lot of sense.
Last edited: