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#7164159 - 05/08/18 04:18 PM Shorter Barrel = Faster speed
Scott W Offline
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Registered: 03/08/18
Posts: 47
Loc: Cedar Park, TX
Saw this video today about the Tikka TAC A1 and at the 1:55 mark he talks about not getting the speed out of Tikka's 24" barrel so he put a 22" Bartlien barrel on it and gains 115 fps.

How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?

https://www.youtube.com/watch?v=shqciW9BgSo

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#7164160 - 05/08/18 04:19 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
Buzzsaw Online   content
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Registered: 06/29/11
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Loc: Frisco, Texas
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#7164161 - 05/08/18 04:21 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
huck18 Offline
Veteran Tracker

Registered: 03/04/10
Posts: 2096
Loc: Ft. Worth, Texas
Originally Posted By: Scott W
Saw this video today about the Tikka TAC A1 and at the 1:55 mark he talks about not getting the speed out of Tikka's 24" barrel so he put a 22" Bartlien barrel on it and gains 115 fps.

How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?

https://www.youtube.com/watch?v=shqciW9BgSo



Every barrel is unique and produces difference results.

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#7164165 - 05/08/18 04:27 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
FiremanJG Online   content
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Registered: 12/16/08
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I'm gonna make an educated guess.

Cut rifled verus button rifled.

What was the twist rate of each? A more agressive twist can reduce velocity.

Did each barrel have the same round count? At least, were both north of 250 rounds, which is where most 6.5mm settle in.
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#7164168 - 05/08/18 04:31 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
redchevy Offline
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Registered: 10/25/04
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Could also be due to the chamber.
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#7164169 - 05/08/18 04:31 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
jeffbird Offline


Registered: 03/09/09
Posts: 2910
Originally Posted By: Scott W


How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?



Tighter bore, which creates more pressure.

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#7164200 - 05/08/18 04:58 PM Re: Shorter Barrel = Faster speed [Re: jeffbird]
SingleShot85 Offline


Registered: 05/27/09
Posts: 1893
Loc: S.A. and Kinney Co.
Originally Posted By: jeffbird
Originally Posted By: Scott W


How does the same ammo produce a faster speed out of a shorter barrel made by a different manufacturer?



Tighter bore, which creates more pressure.


this^^^ is most likely the answer... just watched the video there are tons of difference between those barrels


Edited by SingleShot85 (05/08/18 05:07 PM)

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#7164210 - 05/08/18 05:03 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
booradley Online   content
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Registered: 01/20/11
Posts: 2128
Loc: Justin, TX
Custom vs mass produced barrel? Even though Tikka/Sako are about the best when it comes to factory barrels.
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#7164245 - 05/08/18 05:29 PM Re: Shorter Barrel = Faster speed [Re: booradley]
skinnerback Online   content
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Registered: 05/30/11
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Loc: Rockport, Tx.
Originally Posted By: booradley
Even though Tikka/Sako are about the best when it comes to factory barrels.


loser8

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#7164251 - 05/08/18 05:35 PM Re: Shorter Barrel = Faster speed [Re: jeffbird]
snarkscarbine Offline
Woodsman

Registered: 01/01/17
Posts: 209
Loc: DFW
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Originally Posted By: jeffbird

Tighter bore, which creates more pressure.



Correct.

Actually the Tikka CTR barrels are pretty widely known to be on the slow side. They shoot like lasers, but tend to give up some velocity.

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#7164294 - 05/08/18 06:13 PM Re: Shorter Barrel = Faster speed [Re: snarkscarbine]
FiremanJG Online   content
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Registered: 12/16/08
Posts: 24505
Loc: Wolfe City, TX
Originally Posted By: snarkscarbine
Originally Posted By: FiremanJG
I'm gonna make an educated guess.
Cut rifled verus button rifled.


Nope. Not a factor in and of itself.


Have you seen the tool chatter inside both before?
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#7164303 - 05/08/18 06:22 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
Judd Offline


Registered: 01/22/09
Posts: 11787
Loc: Sachse, TX
I didn't watch the video (blocked here at work) generally speaking a shorter barrel will not yield faster speed. There are other factors...my first two guesses without knowing anything about the issue is 1 - tighter bore as mentioned above...item that popped in my head initially that wasn't mentioned is freebore will effect pressure/speed/etc.
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#7164324 - 05/08/18 06:34 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
Crews Online   content
Tracker

Registered: 07/03/10
Posts: 882
Loc: Houston, Tx
One of them is a Bartlein, and one of them is not. Thatís how.

I have a feeling that researching the gain LH twist thing would make my brain hurt.


Edited by Crews (05/08/18 07:20 PM)

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#7164406 - 05/08/18 07:26 PM Re: Shorter Barrel = Faster speed [Re: Crews]
spg Offline
Pro Tracker

Registered: 08/11/13
Posts: 1537
Originally Posted By: Crews
One of them is a Bartlein, and one of them is not. Thatís how.


^^^Agree^^^ any factory barrel settled in or not can't compare to a Bartlein, two different animals. It's not worth breaking out the measuring tape, that's why I cringe when someone starts talking about brand X is just as accurate as any semi custom or fully custom rifle thats custom chambered by a reputable smith. The only way to get precision accuracy is to have a precision rifle built then develop a custom hand load.

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#7164438 - 05/08/18 07:50 PM Re: Shorter Barrel = Faster speed [Re: Scott W]
DStroud Offline
Pro Tracker

Registered: 11/02/11
Posts: 1734
Loc: Waco
So if it was pressure then the 24 inch could have been loaded to match or exceed the speed of the shorter barrel.... only makes sense.
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