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Do you feel the same about .270 and .308 or 7mm-08? Or is this simply limited to the 300blk, because reasons.

Frankly, I agree that 300blk is one of the best alternative calibers for the AR15. But even as an unapologetic fan, It is far from perfect.  But if your reason for not getting it is because you can physically stuff a 300blk supersonic round into a 5.56 chamber, well maybe you should reconsider owning guns.  And I say that fully expecting that if i was to do something as stupid as jamming a 300blk into a 5.56 chamber and blowing up a gun. I would deserve every bit of ridicule for doing something so irresponsible and foolish..

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You could be right

The thing that I like about 300 blk is low recoil. 65 G and blk are not in thr same universe, 6.5 is 1000 yard round.  300 - I dont know. 200-300 at most.

The thing about 300 is the overall package, the balance of performance, cost, parts, mags.

Quoted:


Do you feel the same about .270 and .308 or 7mm-08? Or is this simply limited to the 300blk, because reasons.

Frankly, I agree that 300blk is one of the best alternative calibers for the AR15. But even as an unapologetic fan, It is far from perfect.  But if your reason for not getting it is because you can physically stuff a 300blk supersonic round into a 5.56 chamber, well maybe you should reconsider owning guns.  And I say that fully expecting that if i was to do something as stupid as jamming a 300blk into a 5.56 chamber and blowing up a gun. I would deserve every bit of ridicule for doing something so irresponsible and foolish..

Quoted:


OK, first of - to preface: It's OK to Like Stuff I don't Like.  If it makes ya smile - enjoy!  

but hey, it's a technical forum and we all have opinions.  To the technical reasoning to address the sensible question - the smart-assed tone of my reply last night aside;  for the most part my pause is around the .300 BO topic.  While it's possible for a .308 to be misfed into a .270, the reality is that's a notably more rare event, because the likelihood of that error happening is lower.  The risk analysis math basically is a combination of:
-How many people have both? (not nearly so many for 270/.308),
-Do they run the same magazines (no for .308/.270),
-Is the magazine capacity such that the offending round is going to be buried and out of sight during handling? (no for .308/270)
-Are the rounds about the same length and mass (no for .308/.270),
-and the big one: How many rounds are fired?  

Interestingly enough, .308's apparently don't automatically Kaboom a .270 like a .300 BO will in a 5.56 chamber.  Apparently the larger .270 chamber is big enough that either it doesn't blow, or if it does, the bolt action is designed for it and it's relieved down the mag well, but doesn't actually destroy the rifle.  Or in the two case-studies I could find, that's what happened there.  I wouldn't bank on it.  But I would bank on a .300 BO doing a grenade Kaboom of a 5.56 AR if you do it.  
https://media.giphy.com/media/bSJ6okx2qcfy07bXE2/giphy.gif
We see "my rifle Kaboomed!"  After "Have Geisselle Call me -  my POS 5.56 rifle Kaboomed! (and no way was it .300 BO, as I keep that on the other side of the room)" post again and again too many times.  

The reality is anyone who owns a .300 BO, also owns a 5.56 AR15.  And they both run the same magazines.  And the rounds are the same length and close to the same weight.  A .300 BO round 5 rounds into a 5.56 magazine is invisible.   And people with such tend to shoot a LOT of rounds, and do so from large magazines at a high rate.   People load so many rounds into AR magazines that they don't consciously go: "OK round onnnee... (looks good looks good) Round twoooo (looks good, same headstamp, all is well), round threee (a tiny bit of additional bullet sealant on the neck here, probably should study that).." conscious study of every round going in; isn't nearly so absolute as people act.  People grab rounds off the table and start stuffing them into the magazine while talking with their buddies about what that sweet BBQ they had last night, is how people actually function.  

While .300 BO is not itself inherently dangerous, it's an armamentarium systemic safety risk.  And yea, that actually does apply to .308/.270 - but .300 BO is a a much higher risk and frequency of occurrence.  Just do a search on AR15 Kabooms here.  There's a reason .357 magnum won't fit in a .38, etc etc.  Do a search on .308 / 270 kabooms, and it's a much shorter search (with apparently very few actually damaging the gun or shooter even).

The first question in the event of a Kaboom thread regarding an AR15 is no longer "Do you reload?", it's now "do you won a .300 BO?".  The dismissal that you yourself of course, would never ever, but ever have such a dumb error, is an assumption of infallibility many many many people also made.  People fuck up and pay WAY less attention to shit than they think they do.  Systemically safe systems help mitigate that.  

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OK, but you're willing to take the risk and you carefully run a check-list everytime you take your gun out, and put in metal tracers in each round and run a special magnet over every magazine or whatever.  Is it still worth it?  well, now we're to the next chapter.  Let's do the math on the advantages of .300 BO.

-It's a subsonic round that works will with suppressors fired out of a 2-handed AR15 platform, and caters particularly well to a SBR system with a suppressor and high rate of fire; for CQB.
Is that you?  Are you running room sweeps with a suppressed SBR?  

because that's where it's advantage starts and ends.  And if you DO want to do that, are you running this as civilian, or as military?  Because if military, then you probably do want those 30 rounds for suppressive fire and continued multiple engagements against a coordinated hostile force.  If civilian, round counts in civilian engagements are WAaaahahhaaaayyyyyy lower than people act.  Kyle R. surrounded by a hostile crowd with multiple separate engages with a 30 round AR15 (5.56 btw), fired about 8 rounds total.  

In the meantime, it's a round that is nearly useless for extended range beyond really even 100 yards.  Firing one at a gong at 200 yards was an exercise in the absurd, at how much hold over I had to do.  but then, maybe that's because my ears were still ringing from the "first shot pop" of the .300 BO "subsonic".  Oopsies, so much for that "advantage".  It's a weak round with 15 (my bad 18) gr of gunpowder power.  That's happy-assed it.  .223 runs about 25-28 gr.  6.5 Grendel runs the same or a touch more.  6.8SPC is about in there too.  If you think you get the same amount of ass with half the powder - ya don't (unless you're running an NFA registered SBR where most of the other guys powder doesn't work.  Are you running an NFA registered SBR?).  

So it's a weak round with terrible trajectory that blows up the other guns in your gun-safe.  That's outclassed in every measure by the other options, which are also safer - excepted if you're running supressed with an SBR, and want 30 rounds doing that.   In the meantime, why does someone want to run such a rig?  Why for room clearing of course - sending 230 gr of power suppressed at room distances is some real performance.  Which.. you can also do with a suppressed .45 at the same terminal performance at that range and have your other hand free to actually open the door and sweap away hostages/wives/whatever.  

Like I say, it's totally cool to like stuff I don't like.  But for someone to claim .300 blk is the best alternative caliber to 5.56, of the spectrum out there, is an absurd statement demonstrating zero analysis of any mission statement to which it actually fits - save one very specialty one (that other rounds can do just fine at).  

Btw, suppressors don't actually work for shit - so if the point is to clear rooms without waking anyone up by running that .300 BO suppressed.  Uh... I've got bad news.  And watch most any hunting video and what's the first thing you see happen when that suppressed gun goes off?  All the animals running like crazy, that's what.

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You took a lot of time to argue against points I never made.  And still only proved you are scared that you are going to screw up and load the wrong round.  You assumed a bunch of stuff, based on nothing I actually said, and your failed attempt to answer the questions I asked falls short,  I said i think the 300blk is one of the best of the alternative calibers, nothing more, and nothing less.  I did not give specifics, You do not know what and or how I choose to use 300blk and in what platform, so again, you said a bunch of stuff without saying anything worthwhile. I also pointed out it is far from perfect.  I don't agree with the OPs assessment as a whole, and frankly your number one reason you gave I find to be colossally ignorant and lazy.  

Your main argument is simply the last in a long line of ignorance spouted ever since AAC and Silvers brought out the 300blk, From million dollar ad campaigns that never existed to Silvers being the devil incarnate.  And yes before you think you need to inform me of the history, I was into 300blk before it existed.  My first 300 whisper AR was a few years before AAC introduced 300blk.  

That being said, I don't really care.  I am a big believer in shoot what you like.  I just don't feel the need to go around and use ignorant talking points to slam other peoples decisions.  But hey that's just me  But I would say, if you are going to point out in a 300blk thread that it will blow up your 5.56 gun then at least have the intellectual honesty to point out the possibility in other calibers, otherwise you are being very selective.  

Lastly, that you think I need some kind of instruction from you on how a suppressor works, shows a high level of arrogance.  I don't need to watch any hunting videos with suppressed 300blk, Since I actually hunt with it I know exactly what it does, and what it sounds like.  I have tested bullets on actual flesh and posted the results then got slammed because some dude with a Youtube channel and properly calibrated ballistic gel said it would not work, and not the clear stuff, only the bad youtube channels use that.  Because properly calibrated ballistic gel trumps actual flesh.

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Of course Grendel is a ballistically superior round but blk is more practical overall. There is a long list of better-performing calibers, 6.5G, 6.8, maybe Valkery, 6mmAR, etc. etc.

Performance alone is not everything, it's the balance of everything.  300 Hammer outperforms blackout yet it's unobtanium. 6.8 and Grendel use special mags that are harder to find. If you have 100 mags for 5.56mm, you can recycle them for the BLK round, perhaps color coding them. Grendel blows extractors.  BLK has milder recoil, very controllable.
No, it does not have the range of 6.5, 6.8 or even 5.56mm. BLK is perfect 0-200 I feel.

fire up google trends and punch in 300 blk, 6.5g, 6.8, 458S  and see what's most popular.

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That is not what I'm getting.  
I didn't say anything about it being the best or not.  Everyone has different needs.  
I'm only stating that there are multiple differences between .300blk and .45 acp.  I don't care if people shoot .300blk or not...do what you want because what is best for one person isn't the best for someone else.  
But the native platforms and bullet designs are so different between .45 and .300blk, that most comparisons between those two calibers make little since.  Very few people hunt with .45.  Very few people do pest control with .45.   Very few people build AR's or bolt actions chambered in .45.  I think there are far AR's in .22LR, 9mm, .350L, and even some big bores shooting subs before there are AR's in 45.   Why compare them?  Outside of similar energy (weight/velocity), they are nothing alike. That is what I'm getting at.
If you are going to artificially limit your sub distance to 50 yards, then yes, they would be fairly similar.  Then again, what would be the point of any long gun/AR pistol chambered in .45 if you restrict the max distance to 50 yards while basically be limited to sub-sonic ammo (outside of shooting for fun)?  It is an artificially capped comparison that makes little sense.