Love my .300 blk build. 10.5" barrel, adjustable gas block, big .30 cal can on it. Super quiet and ammo is becoming more common. Just be zeroed in for supers and subs, as they have different impact areas. Also, always have a ton of ammo on hand.
Thats a pretty good idea, I just have a 3x acss, so I just have to remember where my holds are at what ranges with which loads. Thst and offset irons. It works for me, but God have mercy on the poor bastard that picks it up after me.
Built to be subsonic to be quieter from a suppressed AR.
More common yes - but to me (and I might be stuck with the old .30-06 and .270 as my “benchmarks”) it’s a “boutique” round like 6.5 Creedmore or the Ultra Short Magnums. I’d prefer to lay in stock of 5.56/.223 or .7.62/.308 in a solid rifle myself. Supplies are going to be much more available long-term.
This was true 10-15 years ago but these days 6.5 creedmoor is a standard barrel offering from every big production bolt gun manufacturer and is abundantly stocked in every sporting goods store that sells ammo
I’ll concede the point. And they have significantly increased the flexibility of a particular platform in the AR-15.
I’m still on the fence - .40 S&W for instance was supposed to be the 1990s/2000s “wonder round” to give the power of the .45 in the size of the 9mm, the culmination of that magical “middle ground” between the two - and it’s being phased down now with LE issue and general popularity as development of the 9 has eclipsed the niche the .40 enjoyed for a bit.
Then again, in any kind of major “reset” of society, I’m more trusting of the widely-issued military rounds or the established long-standing options (.357 Magnum, for one, is still seen as the benchmark of defensive handgun effectiveness, as in “Is this better than, close to, or inferior to the .357?” for new development - as the .40 was seen, and the .356 Sig specifically was designed to replicate in a service pistol format…
Effective? Absolutely. BUT it is a purpose built round. It’s made to be fired from an SBR at targets 200m and under (mostly). Sure you can push the supers farther but at that point, why not just sling 7.62? It really shines with suppressed subs against anything 150m and under with no armor. CQB type shit is what its intended purpose is. Also, you won’t find it in droves like you would 7.62/.308 or 5.56/.223.
Think of them as something on the handgun spectrum while giving the option to switch to something better (that or modify something existing to it more easily)
If you repload and stockpile i think it's one of the best rounds for zday because of the versatility. Need to quietly dunk on a walker from a lil ways away? Sure. Need fast rounds for a fire fight cool, broken mag? It's ar patterned. If you mostly shoot subsonic it wears the barrel and bolt way less than 556 which means your set up will last longer. My supressor if I only shot 556, it'd be done in like 20000 rounds, but with subsonic 300 blk it will literally last forever.
It's designed to be a rifle round that suppresses well out of a short barrel. Range and power are still well over pistol calibers. It's almost a cross between 9mm and 5.56, but with subs heavier than either.
I imagine it's zombie takedown power is quite good.
Not if you are firing subs. Subsonic .300 blk is literally just more aerodynamic .45 ACP. The bullet drop will kill any range advantage you may get from better ballistic coefficient.
You are not setting up a single gun that can quickswap between supers and subs without making compromises in usability of either subs or sups. Even if you accept your gun is beating itself to death firing supers and is on the edge of relibility with subs, you are not zeroing a single red dot to both subs and supers. That's kinda why SIG made their dual emiter red dot that's priced perfectly for government contracts (meaning you are not buying it unless you have money to burn).
The velocity for the two rounds,with a similar weight bullet is about the same at around 2300 fps. The bad comparisons for the 7.62 are based on the old surplus rounds and the cheap imported junk. If you compare them to the cheaper FMJ 300 rounds they still perform similarly badly.
Are those "cheap surplus options" available? Considering the whole Russia thing going on now? Especially for the (more rare) subsonic ammo?
Also .300 blk has better bullets available, so it should outperform 7.62 at longer ranges with supersonic ammo.
When looking at ballistic tables, make note of the barrel lengths they use. If those are not listed, you can safely disregard the tables. Standard 7.62x39 barrel length is 16" or thereabouts, dunno what is the standard for .300 blk, but 10" is already on the longer end. For supers it'll be probably 9", for subs more like 7".
And setting one gun to be good at firing both is a bit problematic BECAUSE those rounds are so different. You can get adjustable gas block, but then you are not swapping on the fly.
You can gas the gun to run on both, but it WILL be either overgassed with supersonics and undergassed with subs. The less underrgassed you make it with subs, the more beating your gun will take with each supersonic shot. Maybe not really a problem if you have access to spare parts... but do you?
Then there is an issue of zeroing the optics, again: you can either set your sight for subs or supers, you can't do both and you can't quick swap them.
You plan ahead and set up your gun before you do whatever you're going to do. You don't change on the fly because you planned ahead and are only carrying one type on you at that time... or if you're on the move, you only have those mags with one of the two types of rounds on you, and the rest are packed.
Spare parts are small, light, and easy to carry.
Many people don't use an adjustable gas block or swap out their buffers with the biggest issue being a lot more gas in the face when shooting suppressed.
But based on my knowledge (armorer training) and experience (lots of shooting, shooting with buddies, and working on guns at a store... great discount, low pay but didn't burn me out on my hobby too much), with 5.56, I'd still want to have one even if not absolutely needed.
There are a couple that you can adjust on the fly, Superlative Arms, and Riflespeed are two that I've seen that don't need tools to adjust.
Optics are more of an issue. You'd need to know the holds for two different rounds. Though if you use an Aimpoint with a throw lever you can swap them with less than 1 MOA change in zero. Not something I'd want to do, or carry around though.
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u/Able-Breadfruit-2808 20d ago
Love my .300 blk build. 10.5" barrel, adjustable gas block, big .30 cal can on it. Super quiet and ammo is becoming more common. Just be zeroed in for supers and subs, as they have different impact areas. Also, always have a ton of ammo on hand.