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6.5 twist requirements

 
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  #1  
Old 07-21-2005, 09:12 PM
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6.5 twist requirements

What is the neccessary twist for a 6.5- 300 wsm ? Understandably, this will not be a target gun, but rather for big game hunting only.

Kirby, or someone who knows, what is the required twist for a 6.5 Allen Mag ? Again, built for hunting.

thank you
Joe
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  #2  
Old 07-21-2005, 09:45 PM
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Re: 6.5 twist requirements

Joe,

For the 6.5 WSMs I have built, I have only used 1-8 twist barrels, Lilja and Broughtons. Both shot every bullet from 100 to 155 gr extremely well.

IF you will be shooting 120 to 140 class big game bullets the 1-9 twist will be plenty in a rifle. Just for instance, My 6.5-06 AI shoots the old 155 gr SMKs into tight little groups and it has a 1-9 twist barrel.

Same goes for the 6.5mm Allen Mag. If you will be shooting 120-140 gr bullets I would recommend a 1-9 or 1-10. IF your planning on VLD or ULD bullets, first off, they have to survive the velocity potential and second I would recommend a 1-9 for the 140-142 class VLDs and a 1-8 for the heavier pills such as the 150, 160, 165 and 169.5 gr ULD RBBTs.

These are still to be tested. I have the receiver, stock and barrel, just need about 10 free hours to put her together, don;t see that happening anytime soon but I hope it happens here in the next couple weeks.

Basically for conventional big game bullets, the 1-9 is hard to beat for all hunting conditions with the 6.5mm rounds.

Kirby Allen(50)
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Kirby Allen(50)

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  #3  
Old 07-21-2005, 11:17 PM
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Re: 6.5 twist requirements

What's your hunting altitude?
For a 142ULD, 1:9 works in Montana . Near sea level, 1:8 is marginal.
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  #4  
Old 07-22-2005, 08:30 AM
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Re: 6.5 twist requirements

Mikecr,

If you want to use the 142 gr ULDs I would use the 1-8 twist, especially in the 6.5 WSM class rounds.

For the 6.5mm Allen Mag, I have to test this and see if the bullets will handle the strain of this twist at these velocities, I suspect a 1-9 would be a better choice but thats adding 500-600 fps to the WSM velocity potential, hell, a 1-10 may be all that is needed??? Have to test it yet.

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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  #5  
Old 07-22-2005, 10:47 AM
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Re: 6.5 twist requirements

Kirby-- why would the 142WC need more twist that a 140amax or 142SMK?

look the same length in my pic... or within 10thou anyway.



the little squares are 1mm or about 0.040"

JB
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  #6  
Old 07-22-2005, 01:12 PM
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Re: 6.5 twist requirements

jb100br,
Thank you, now I understand why a picture is worth a thousand words. Kirby, thank you too, I guess you realize you shot my idea down.
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  #7  
Old 07-22-2005, 01:15 PM
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Re: 6.5 twist requirements

JB,

They wouldn't.

Lilja recommend a 1-8 for all the 140-155 gr VLD designs. Dan is alot like me, better to be conservative then to deal with pissed off customers.

I have used the 1-9s with the 140-155 gr VLDs and have had great results but still would prefer a 1-8 just for the extremes.

Also for big game hunting I would rather have a bit more spin. I do not BR shoot so the absolute ultimate in accuracy as far as matching bullets to twist rates concerns me very little. I want as much accuracy as I can get in a 100% reliable package. For that reason I recommend 1" faster twists then what is probably needed, still, you will not go wrong with this class of round.

Now for the 6.5 AM, with the dramatically higher velocity, bullet integrity will be an issue so I would recommend dropping to a 1-9 or even 1-10 but like I said, I will need to test that to make a solid recommendation with that round.

Kirby Allen(50)
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Kirby Allen(50)

Allen Precision Shooting
Home of the Allen Magnum, Allen Xpress and Allen Tactical Wildcats and the Painkiller Muzzle brakes.

Farther, Faster and Flatter then ever before.

Web Page: www.apsrifles.com

allenmagnum@gmail.com
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