Oh, not the comparison of the 300 hiccup to the 762x39 and the 30/30.
With light bullets(125-130 grain), the 300 makes the 762 look plenty powerful and the 30/30 look like a workhorse.
The niche the 300 fits is the suppressed heavy subsonic (190+ bullets) from SBR or pistol configs.
And that fits inside the CQB/covert niche and not much else.
The 300 heavy is akin to a suppressed 45ACP in energy and useful range, but in a much more useful and accurate package.
300 light bullet carbine set ups fall under the useful parameters of just about any thing else.
But, hey, enjoy!
Just made a 300 Ham’r upper, blows my 300Blk away.
Newly manufactured brass is now widely available, loading is not a problem, although converting .223/5.56 brass can be a pleasant task. My rifle has never seen a factory round.
You’re certainly right on the technical specifications and ballistic comparisons of 300 bLK to 7.62, .45 ACP, et al.
Except many shooters do enjoy this round because it provides unique advantages, like the ability to swap from supersonic to subsonic and suppressed with nothing more than a magazine change. Most would agree a cartridge with the ballistic performance of .45 ACP and the stability, accuracy, and increased range of the AR platform far out-performs any other sub-gun or pistol configuration.
It’s also important to remember 300 BLK was developed specifically for US special operations. It doesn’t translate into much practical use in the civilian world, but it’s a wickedly fun (and still potent) cartridge nonetheless.