300aac blackout 9inch barrel vs 16 inch barrel

Discussion about rifles in 300 AAC BLACKOUT (7.62x35mm), hosted by the creator of the cartridge.

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bangbangping
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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by bangbangping » Sat Mar 14, 2020 10:46 pm

Silverback wrote:
Sat Mar 14, 2020 10:19 pm
Planning on reloading shooting 110 or124 grain and 220 grain. Going to eventually pick up supressor.

I just hate wasting that energy potential.

Would a 16 inch barrel be fine for super and supressed?
Nothing at all wrong with a 16", other than a it's a bit cumbersome with a suppressor attached.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by Silverback » Sat Mar 14, 2020 11:15 pm

I figured that would be the case but the energy gains from 10 to 16 is around 200 with the various loads.
I dont see myself using subs all that often.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by bearcatrp » Sun Mar 15, 2020 10:32 am

I had a 16 inch barrel and currently own a 10 inch barrel AR. Around 250 fps difference with my loads of 110 v-max.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by dellet » Sun Mar 15, 2020 12:56 pm

Silverback wrote:
Sat Mar 14, 2020 10:19 pm
Planning on reloading shooting 110 or124 grain and 220 grain. Going to eventually pick up supressor.

I just hate wasting that energy potential.

Would a 16 inch barrel be fine for super and supressed?
You have fundamental misunderstanding of energy potential.

I don’t care how heavy a bullet is or how fast it’s going, every ounce of potential energy is wasted if you don’t know where to put it, or can’t. This is not a cartridge problem, a barrel length problem or a bullet problem. It is now, always has been, and always will be, a guy that pulls the trigger problem.

You need to match bullet design and weight for the distance and creature you will be killing. That has to be matched to your ability.

Once you have that information, then someone can advise what might be your best tool for the job.

The recommended on target energy by the book for medium sized game is 1000 pounds. That means impact velocity needs to be

110 grain, 2000 fps
125 grain, 1875 fps
150 grain, 1725 fps.

That means by the book a Barnes 110 in a 16” barrel @ 2400 fps. has an effective range of about 125 yards, and 75 yards in a 9” based on 2200 fps.

If you compare that to a Speer 150 Gold Dot
16” barrel MV 2150 fps, 250 yards
9” barrel MV 1950 fps. 150 yards.

Somewhere in between is a 125 grain bullet.

You gain more energy by adding bullet weight, than barrel length, if you use both the gain per inch past 22 is almost pointless, but can help with accuracy.
300 Blackout, not just for sub-sonics.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by Silverback » Sun Mar 15, 2020 3:42 pm

I was referring to foot pounnds energy not velocity or fps. Sorry I didn't make that clear.
Last edited by Silverback on Sun Mar 15, 2020 3:51 pm, edited 1 time in total.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by Silverback » Sun Mar 15, 2020 3:51 pm

bearcatrp wrote:
Sun Mar 15, 2020 10:32 am
I had a 16 inch barrel and currently own a 10 inch barrel AR. Around 250 fps difference with my loads of 110 v-max.
There is also about a 200 foot pounds of energy lost.
Which can be significant.
https://youtu.be/4VNl7QXykUY

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by Silverback » Sun Mar 15, 2020 4:43 pm

Man if I could afford a tavor itbqoukd be a non issue
Great 223 and 300 in same package. Oh well, I appreciate the discussion and education you guys are willing to depart with. Please keep it coming. The more info the better my decision.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by bearcatrp » Sun Mar 15, 2020 7:48 pm

Silverback wrote:
Sun Mar 15, 2020 3:51 pm
bearcatrp wrote:
Sun Mar 15, 2020 10:32 am
I had a 16 inch barrel and currently own a 10 inch barrel AR. Around 250 fps difference with my loads of 110 v-max.
There is also about a 200 foot pounds of energy lost.
Which can be significant.
https://youtu.be/4VNl7QXykUY
1037 for 16 inch vs 938 of energy with my 10 inch @100 yards according to StrelokPro I use.

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by Silverback » Sun Mar 15, 2020 7:59 pm

bearcatrp wrote:
Sun Mar 15, 2020 7:48 pm
Silverback wrote:
Sun Mar 15, 2020 3:51 pm
bearcatrp wrote:
Sun Mar 15, 2020 10:32 am
I had a 16 inch barrel and currently own a 10 inch barrel AR. Around 250 fps difference with my loads of 110 v-max.
There is also about a 200 foot pounds of energy lost.
Which can be significant.
https://youtu.be/4VNl7QXykUY
1037 for 16 inch vs 938 of energy with my 10 inch @100 yards according to StrelokPro I use.
Hmmm.... that narrows the gap in was seeing on the video. Definitely food for more thought. What is the comparable fps?

Thanks for your input

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Re: 300aac blackout 9inch barrel vs 16 inch barrel

Post by Silverback » Sat Mar 21, 2020 1:35 pm

Here is an example of the difference in ME

9:30. Mins.....

https://youtu.be/R2RR_5Kw1Ds

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