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Velocity Question?

 
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  #1  
Old 06-01-2011, 11:44 PM
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Velocity Question?

What kind of velocity can I expect out of a 26" barrel with out of a 6.5-284 with 140gr berger vlds, retumbo powder, lapua cases?

Thanks
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Last edited by ovastafford; 06-01-2011 at 11:54 PM.
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  #2  
Old 06-02-2011, 08:25 AM
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Re: Velocity Question?

2950 to 3000
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  #3  
Old 06-02-2011, 09:14 PM
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Re: Velocity Question?

I agree with Team Roper.

I've only shot one ladder with my new 6.5x284. But, I was getting 2898-2907 from my 24" barrel using 51.3gr H4831sc and 142gr SMKs.

That's listed as a max load. But, I didn't see any signs of pressure.

2" more should be worth another 50-100 fps.

-- richard
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  #4  
Old 06-02-2011, 10:18 PM
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Re: Velocity Question?

I was shooting Richards listed load in my f-class gun, a 30" barrel was giving me 3025 fps.

started to show some pressure with barrel heat during long stings of fire, so today I loaded down 200 cases to 50.6, and I culled out about 12 pcs of twice fired brass that had loose pockets.

Retumbo might be a tad slow for it.
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Old 06-02-2011, 10:19 PM
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Re: Velocity Question?

Yup around 3,000 was where I started to see pressure signs. What about H4350 and 4831?

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  #6  
Old 06-02-2011, 10:25 PM
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Re: Velocity Question?

Quote:
Originally Posted by ovastafford View Post
Yup around 3,000 was where I started to see pressure signs. What about H4350 and 4831?

Thanks
H4350 is a great powder for 6.5mm cartridges. I send the 142SMK at 2950fps with 43.5grains of H4350 in my 28" barrel 260Rem. My 260 by MCR

Given the 6.5x284 is a larger case than the 260, I would think you could easily at 3000fps with the 140grain class bullets.
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  #7  
Old 06-03-2011, 08:13 AM
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Re: Velocity Question?

Quote:
Originally Posted by Coyboy View Post
I was shooting Richards listed load in my f-class gun, a 30" barrel was giving me 3025 fps.

started to show some pressure with barrel heat during long stings of fire, so today I loaded down 200 cases to 50.6, and I culled out about 12 pcs of twice fired brass that had loose pockets.

Retumbo might be a tad slow for it.
The same 51.3gr of h4831sc in my 30" (1:8") Savage 12F only gained me about 50 fps vs my 24" (1:8.25") Kreiger barrel with a match chamber. And, it was beginning to show some signs of pressure in the Savage.

I would've expected a bigger gain with a 6" longer barrel whereas Coyboy reports 125fps gain with his 30" barrel.

Maybe this new rifle is exceptional? Or, perhaps my chrony is off? I wonder now how much difference there is in the COAL/case capacity?

I guess it just shows that every rifle is different.

--richard
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