300 blackout build

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RMears 45
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300 blackout build

Post by RMears 45 »

I am thinking about a 300 blackout build soon. Most people seem to be doing a 10-12" barrel in the AR platform. Is this the best barrel length? I'm looking at a Ruger American bolt gun. I can do the Tactical Solutions SBX style cage on a 12" barrel, blind pin a dedicated can on the barrel or I can leave the 16" barrel uncut and use the factory threads. I can't decide.
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doubloon
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Re: 300 blackout build

Post by doubloon »

I had the SBX style cage on a 9mm rifle before, for me it ended up being not worth the complications.

I have an SBX barrel on a 10/22 and I plan to get rid of it one day because cleaning the crown, retrieving an end cap, etc. are all more trouble than the barrel is worth to me.

If I had an itch for a shorter mounted length again in the future I'd just go SBR and lose the cage.
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CanOfWhooppass
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Re: 300 blackout build

Post by CanOfWhooppass »

There is almost no gains past 9" in performance - 8" is popular on AR's, just make sure the barrel is long enough for the suppressor you want to use.

SBR is more hastle to travel with across state lines than a suppressor.
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Re: 300 blackout build

Post by Tony M. »

I've got the Ruger American in .300BO and so far I've left it at 16" and had fine results. That said; a shorter barrel would be stiffer, and would keep the length and weight down more.

I have no complaints about my 16" barrel, but if I had money to throw away, I would consider SBR'ing it just to reduce the OAL a bit. And besides, who doesn't want an SBR bolt action?
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CanOfWhooppass
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Re: 300 blackout build

Post by CanOfWhooppass »

I picked up a 300 Blackout Handi rifle and even with the 16" barrel and saker it is a short and happy giggle stick!
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T-Rex
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Re: 300 blackout build

Post by T-Rex »

AAC designed their primary AR platform with a 9" bbl because, as COW stated, there are no performance gains beyond.
If limited to length, I'd rather have a longer suppressor.
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Re: 300 blackout build

Post by stengun »

Howdy,

I went with a 10.5" barrel myself because it's worth about 50 feet per second of velocity over a 9" barrel and about 75-100 over and 8" barrel.

Also I feel the slightly longer barrel solves some of the function and BHO issues that crop up with the shorter barrels.

Just my $.02.

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savagetactical
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Re: 300 blackout build

Post by savagetactical »

Saying there isn't any gains past 9" is pure BS. I have chronographed about 150 fps difference between my 9" pistol and 14.5" rifle shooting the same handloads. The manufactures claim that longer than 16" you start to get diminishing returns. Considering most of the light weight 308 bullets don't reliably expand below 2000 fps, shooting a bullet at 2350-2400 versus 2200-2250 nearly doubles your bullet's expansion range.

If this was a range toy or house gun, 9" would be fine. If it is intended to be an unsuppressed hunting gun or you don't want to deal with the hassle of a SBR I'd go with a 16" barrel. A 12" rifle would be a good compromise between both - you can gain probably 50-100 fps for hunting yet the rifle is still a handy size with a suppressor.
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CanOfWhooppass
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Re: 300 blackout build

Post by CanOfWhooppass »

savagetactical wrote:Saying there isn't any gains past 9" is pure BS. I have chronographed about 150 fps difference between my 9" pistol and 14.5" rifle shooting the same handloads. The manufactures claim that longer than 16" you start to get diminishing returns. Considering most of the light weight 308 bullets don't reliably expand below 2000 fps, shooting a bullet at 2350-2400 versus 2200-2250 nearly doubles your bullet's expansion range.

If this was a range toy or house gun, 9" would be fine. If it is intended to be an unsuppressed hunting gun or you don't want to deal with the hassle of a SBR I'd go with a 16" barrel. A 12" rifle would be a good compromise between both - you can gain probably 50-100 fps for hunting yet the rifle is still a handy size with a suppressor.
I didn't say no gains past 9".
Your saying if you increase the barrel length of your 9" by just over 60%, you can increase velocity by about 7%.

That's not much compared to most rifle rounds. Subsonic pick up something like 7fps for each extra inch.

Good points about bullet performance, but if bullet is so marginal that 150 fps is relent to a humane kill, I'd trade up myself.
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stengun
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Re: 300 blackout build

Post by stengun »

Howdy,

I've used my .300Blk to take a medium sized 8-point back in November so I'm going to agree with savagetactical on this one.

The .300Blk is a short range round and that extra 100fps makes the difference between a humane kill and a wounded deer that runs off and dies later. It also increases your hunting distance another 25-35 yards and makes for a flatter trajectory.

Now, if I was only being concerned with being "TACTICOOL" I would go with a shorter barrel because it doesn't matter to a paper target as long as the bullet will poke a hole through the paper and the short barrel will really impress the "Gunshop Kommandos" at the LGS.

A shorter barrel might be a little handier during CQB ( I've seen people shoot their hand/fingers while using a really short barreled SMG by placing in front of the muzzle during the heat of battle. ) but I'm willing to bet that it I use my 10.5" barreled .300Blk for CQB and I pop someone 3 or 4 times with my handloads using a Speer 125gr TNT over 18.1gr of H110 that the BG's last words will NOT be "I would have died quicker if you had used an 8" barrel."

Just my $.02.

Paul

P.S. You do know what Rubio would say about someone using a really short barrel............
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T-Rex
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Re: 300 blackout build

Post by T-Rex »

If 100fps is the difference between a kill and a limping animal, you need to revise your strategy.
100fps is nothing, absolutely nothing (when considering typical deer hunting ranges with the mentioned platforms). A temperature fluctuation can easily eat 50fps, then add a couple extra yards of bullet travel and there goes your other 50fps.

This is the OP:
"I am thinking about a 300 blackout build soon. Most people seem to be doing a 10-12" barrel in the AR platform. Is this the best barrel length? I'm looking at a Ruger American bolt gun. I can do the Tactical Solutions SBX style cage on a 12" barrel, blind pin a dedicated can on the barrel or I can leave the 16" barrel uncut and use the factory threads. I can't decide."

Nowhere do I see any reference to needing maximum velocity for penetration and bullet deformation, for hunting purposes.
I think a reply of keeping the bbl within a Mfr's recommended range and maximizing suppressor length, to facilitate an OAL of 16.001" to be an acceptable answer.
Also, I doubt he is doing CQB with a bolt gun.

To the OP:
What is your primary function for this rifle?
What is more important to you, given: bullet performance, platform weight or OAL?
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CanOfWhooppass
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Re: 300 blackout build

Post by CanOfWhooppass »

I'll go ahead and fully agree with you guys that 300 Blackout supers benefit from that little extra push. If bullet performance is important though, a cartridge that can hold a little more powder seems like a better solution to me.
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Tony M.
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Re: 300 blackout build

Post by Tony M. »

I just hand load my ammo.

Then my barrel length doesn't matter as much because I can tune my load to get the performance I want.
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Re: 300 blackout build

Post by smustian »

savagetactical wrote:Saying there isn't any gains past 9" is pure BS. I have chronographed about 150 fps difference between my 9" pistol and 14.5" rifle shooting the same handloads. The manufactures claim that longer than 16" you start to get diminishing returns. Considering most of the light weight 308 bullets don't reliably expand below 2000 fps, shooting a bullet at 2350-2400 versus 2200-2250 nearly doubles your bullet's expansion range.

If this was a range toy or house gun, 9" would be fine. If it is intended to be an unsuppressed hunting gun or you don't want to deal with the hassle of a SBR I'd go with a 16" barrel. A 12" rifle would be a good compromise between both - you can gain probably 50-100 fps for hunting yet the rifle is still a handy size with a suppressor.
You have to be picky with the bullet you use if you want to hunt with it. A standard 30 cal bullet will not expand a 300 blk speeds. Go over to 300Blktalk.com and look in the hunting section to find bullets that are proven in the field. Barnes 110 black tip, Hornady 125 SST and Nosler 125 green tip come to mind.
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Re: 300 blackout build

Post by Theohazard »

I think some of the people here are talking past each other.

A longer barrel makes virtually no difference when shooting subsonic ammo.

But a longer barrel does give you more velocity when you're shooting supersonic ammo, though the increase isn't as steep as it is with other rifle rounds.
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Re: 300 blackout build

Post by hardcase »

If you research a bit in the hunting section of the 300 AAC Blackout website you will find several work arounds for the 2,000 fps limit for deer hunting. Notably is the bullet from Lehigh defense. Since I reload I don't have any problems. I've not research store bought ammo but if you look into that section, I think you will find adequate ammo. http://www.300blktalk.com/forum/viewfor ... 4355f31dc2
RMears 45
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Re: 300 blackout build

Post by RMears 45 »

The rifle will be clanging steel 75% of the time, but I do have some armadillo problems at the range and coyotes in the cow pasture. So it will not be used for taking large game just plinking and general pest control.
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savagetactical
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Re: 300 blackout build

Post by savagetactical »

RMears 45 wrote:The rifle will be clanging steel 75% of the time, but I do have some armadillo problems at the range and coyotes in the cow pasture. So it will not be used for taking large game just plinking and general pest control.
Sorry man, I missed the part where you said it would be a Ruger American. I keyed off of the build statement and the mention of 10-12" AR at the beginning of the post and had ARs on my mind. Most people who build 300 blk ARs choose the shorter barrel lengths because they make a really short gun for CQB applications. I think the 10-12 inches are popular because that is about the size of most of the Short barrelled 556 guns like the HK416 & Colt Mk18 (both 10.5" guns) so its a size they are use to.

My Folks have one of those Rugers and it is a good gun for the price. If I was you, I'd keep the barrel at the stock 16". Those 16" bolt guns are really handy and nice to carry (because they weigh so much less than a semi-auto gun), even with a nice light weight suppressor. For suppressors, I'd recommend getting a really nice thread-on Titanium suppressor like a Thunderbeast or equivalent if price isn't a problem.
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