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#6984578 - 12/05/17 08:07 PM 12.5” 6.5 creedmoor SBR testing
Tye Offline
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Registered: 01/18/07
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Loc: Eastland county
Went out to LSA private shooting range with the owner of Lonestar Armory to test some guns they are making. For the first outing with the 12.5” was quite fun. We tried several different makes of factory ammo. Here are some of the pics I took. It looks like you lose about 50 FPS for every inch cut off the barrel.



Edited by Tye (12/05/17 08:08 PM)
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Originally Posted By: AmoCuernos
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#6984584 - 12/05/17 08:10 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Tye Offline
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Registered: 01/18/07
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Loc: Eastland county
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#6984585 - 12/05/17 08:11 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Tye Offline
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Registered: 01/18/07
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Loc: Eastland county
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#6984590 - 12/05/17 08:15 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Tye Offline
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Registered: 01/18/07
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Loc: Eastland county


Unfortunately we weren’t able to do some long range shooting today. We were busy testing different rifle builds. I’ll share some of the conex towers they have to shoot from. They offer private instruction and will be hosting several long range matches. I think the next one is in March
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#6984592 - 12/05/17 08:15 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Tye Offline
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Registered: 01/18/07
Posts: 3364
Loc: Eastland county
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#6984596 - 12/05/17 08:17 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Tye Offline
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Registered: 01/18/07
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Loc: Eastland county
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#6984653 - 12/05/17 08:51 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
daniel1381 Offline
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Registered: 03/07/12
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Loc: longview texas
Very nice love short barrels


Edited by daniel1381 (12/06/17 03:11 PM)
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#6984754 - 12/05/17 10:42 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
kmon1 Offline
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Registered: 09/27/06
Posts: 22465
Loc: Texas
Looks like a fun day
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#6987266 - 12/07/17 03:08 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Misfire Offline
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Registered: 02/16/11
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Loc: Hood County
That looks like pretty respectable velocity for a 12.5"er. I bet she is LOUD without a suppressor. I'm considering a 16" or 18" 6.5 CM as my next project.

.
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#6987283 - 12/07/17 03:22 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
ChadTRG42 Offline
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Registered: 09/16/09
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Very interesting. Are you running an adjustable gas block? With a really short barrel, you are losing most of your pressure at 12.5", which doesn't allow the bullet to get up to speed. Generally you will lose about 20-25 fps per inch with normal lengths (20"24"). When you go much shorter, the bullet doesn't have the pressure behind it. I'm showing at 12.5" barrel, the exit pressure is 22K psi. Normal exit pressure in a 22" is about 11K to 12K psi. So, there's a lot of pressure lost with a 12.5" barrel with typical 6.5 CM powders. If you went to a faster burning powder like Varget or 8208, I'm showing about a 100 fps gain with a 140 grain in a 12.5" barrel. If you want more speed, that may help.
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#6987346 - 12/07/17 04:13 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Misfire]
Huckleberry75 Offline
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Registered: 03/23/16
Posts: 162
Loc: Yukon, OK
I have thought the same thing about a 16-18" 6 or 6.5cm. Put it in a manners ehf1 and you got a handy little truck gun/ trunk monkey.


Edited by Huckleberry75 (12/07/17 04:15 PM)
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#6987373 - 12/07/17 04:33 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: ChadTRG42]
Tye Offline
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Registered: 01/18/07
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Loc: Eastland county
Originally Posted By: ChadTRG42
Very interesting. Are you running an adjustable gas block? With a really short barrel, you are losing most of your pressure at 12.5", which doesn't allow the bullet to get up to speed. Generally you will lose about 20-25 fps per inch with normal lengths (20"24"). When you go much shorter, the bullet doesn't have the pressure behind it. I'm showing at 12.5" barrel, the exit pressure is 22K psi. Normal exit pressure in a 22" is about 11K to 12K psi. So, there's a lot of pressure lost with a 12.5" barrel with typical 6.5 CM powders. If you went to a faster burning powder like Varget or 8208, I'm showing about a 100 fps gain with a 140 grain in a 12.5" barrel. If you want more speed, that may help.



I believe there was an adjustable gas block on that build. He is testing several different things with a 308, 6 Creed and 6.5 Creed. I’ll pass the info along. The group posted was my hand loads for my 22” Creed gas gun. With those loads, my 22” Creed gas gun gets around 2600 FPS. The same loads in the 16” Creed gas gun were 2400 FPS and the 12.5” was 2200 FPS . That was 33 FPS different from 22” to 16” and 50 FPS from 16” to 12.5” approx.

What is that charge weight for Varget using 143 ELDX bullets?
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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#6997055 - 12/14/17 09:40 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
Dien Offline
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Registered: 08/16/12
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Loc: Grand Prairie
Any problems cycling?

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#6997082 - 12/14/17 09:53 PM Re: 12.5” 6.5 creedmoor SBR testing [Re: Tye]
kmon1 Offline
junior

Registered: 09/27/06
Posts: 22465
Loc: Texas
That's only about 50 to 100fps more than I have seen reported from a Grendel with a 140gr bullet but it is a bit more efficient with less of a faster burning powder. Not as much hot gas for the can to catch either.

Like Chad said a faster powder should get you more velocity from that short barrel
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#6997299 - 12/15/17 07:46 AM Re: 12.5” 6.5 creedmoor SBR testing [Re: Dien]
Tye Offline
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Registered: 01/18/07
Posts: 3364
Loc: Eastland county
Originally Posted By: Dien
Any problems cycling?


The gun cycled fine. But I know of others toying with that SBR that did have issues.
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Originally Posted By: AmoCuernos
If you shoot a young deer because a neighbor will shoot it, you are that neighbor.

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