Originally Posted by
grizzman
The users of these two weapons aren't likely to care about bullet weights and muzzle velocities.
A 300 Blackout SBR is a rifle firing a rifle cartridge. If rifle calibers are allowed at the range, then they're fine. If they're not allowed, then this rifle isn't allowed.
A 10mm Auto carbine is firing a pistol cartridge. If pistol caliber carbines are allowed at the range, then they're fine. If they aren't allowed, then the rifle isn't allowed.
The easy answer is that if a cartridge was initially developed for use in a handgun, then it's a pistol caliber. If the cartridge was initially developed for use in a rifle or carbine, then it's a rifle caliber. There's little to benefit by making this more complicated than it needs to be.
So if you were serving as the range master at a pistol caliber-only range, and you had one shooter firing a 208gr 300 BLK projectile traveling at 915 fps (387 ft-lbs muzzle energy) and you had another firing a 60gr 10mm projectile traveling at ~2793 fps (1039 ft-lbs muzzle energy), you would kick the first guy off the range because he was firing a cartridge "initially developed for use in a rifle" but you'd be OK with the second because he was firing a cartridge "initially developed for use in a handgun"?
"The nation that will insist on drawing a broad line of demarcation between the fighting man and the thinking man is liable to find its fighting done by fools and its thinking done by cowards."
William Francis Butler
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