Question about the 300 blackout..

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Well subs will obviously be around 1070-1100fps, supers are around 2150-2250

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is there some hidden thing that makes them popular right now? Other than being something new?

It got approved by saami a few years back which made it take off like crazy.

Otherwise it was better known as 300 whisper. Little changes made it the blackout.

Being approve by saami meant there was a standard. 300 whisper could have different reamers and specs because there was no standard.

Plus the big machine picked up 300 blackout and with tons of marketing behind it you see what happens.

Similar rounds have been around for a long long time before the blackout became popular

My 300 blackout won't cycle those Hornady 208 grain cartridges. It cycles supers just fine. I haven't gone through the process of doing the SBR so I'm shooting a long barrel. I've heard that I might need to get a different spring in the buffer tube as I don't have an adjustable gas block. Any suggestions are welcome.

You can either look at the adjustability of the jp spring system but they are a little bit expensive. You wouldn't be changing the spring in the stock but more likely the buffer weight. When I was building my 16inch 300 black I ended up drilling out the gas port in the barrel because that was my limiting factor in the gas system since my adjustable gas block was already maxed out and it still wouldn't cycle suns perfectly. Now most people will not have to go that far.

I am running a suppressor. I think a few of the times it didn't even reset the trigger, so it's obviously not going back far enough. What's weird though is that it would sometimes load a super if it was the next round after a sub, so perhaps it's got something to do with the cartridge.

This article has a bunch of chronographed loads, both factory and handloads, in both carbine and pistol length barrels. "Loading the 300 Whisper"..

Back in '01 I bought a 12" Contender barrel in 300/221 (it was a "300 Whisper", but couldn't be labeled as such as it wasn't made by SSK Industries.) JD Jones was the legendary gunsmith/shooter who owned SSK Industries and developed an entire series of "Whisper" cartridges. The cartridge was designed for self-defense/tactical uses in the AR 15 platform using either sub or supersonic loads. Unfortunately, this was before the AR craze. He copyrighted the "Whispers", but didn't submit them for SAAMI specifications. None of the big arms makers got behind the 300 Whisper. The 300 Blackout was developed at the perfect time w/ the AR craze and also had the support of Big Green.

My barrel has the proper fast twist (1:8") to handle both sub and supersonic loads, but I bought my to hunt w/ using supersonic loads. I've killed 2 whitetail deer w/ mine. My barrel pushed 125 gr Nosler BT's to 2250 fps and 130 gr Single Shot Pistol bullets (discontinued yrs ago) to 2200 fps. W/ the proper loads, the 300 Whisper/300 Blackout is a nice 200 yard deer gun w/ minimal muzzle blast and recoil. I even had a 20" Contender carbine barrel built to be my son's first deer gun. It's been a few years since I've hunted w/ it. Whenever I shoot it, I'm amazed how much velocity the supersonic loads get from only 17-18 grains of powder. I'd be hard pressed to find a better starter youth gun than a AR 15 carbine w/ adjustable buttstock chambered in 300 Whisper/300 BO.

Nobody really "needs" an AR either, but they are fun. I personally like being able to hear the thump of the bullet hitting a pig. It's also really interesting and a bit scary to hear the ricochet noises.

There is a reason most swat teams have made the switch. go to an indoor range and take off your earpro. Now just imagine that with a high power rifle. I would say a suppressor is a very good fit on an sbr in the home.