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Why is the 25-06 slower then the 30-06 with the same Bullet weight?

 
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  #8  
Old 08-24-2011, 06:26 PM
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Join Date: Jun 2011
Location: WY
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Re: Why is the 25-06 slower then the 30-06 with the same Bullet weight?

I got over 3100 in my factory kimber 2506 with H1000 1 grain below bergers max with no pressure signs whatsoever. I backed down for accuracy, es, and sd and settled with 56.5 grains H1000 at 3080fps. This is with the 115 vld. You could probably get 3200 in some rifles, whether or not that's where accuracy, es, and sd are best is the question. Velocity sure helps but is not most important in my opinion.
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  #9  
Old 08-24-2011, 06:28 PM
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Re: Why is the 25-06 slower then the 30-06 with the same Bullet weight?

110 grain accubonds also shot well in my factory rifle, my preference is the vld.
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  #10  
Old 08-24-2011, 08:20 PM
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Re: Why is the 25-06 slower then the 30-06 with the same Bullet weight?

What load were you using for the 110 acubond?
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  #11  
Old 08-24-2011, 09:15 PM
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Re: Why is the 25-06 slower then the 30-06 with the same Bullet weight?

mine was with 50 gr of imr 4831.
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  #12  
Old 08-24-2011, 11:35 PM
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Re: Why is the 25-06 slower then the 30-06 with the same Bullet weight?

Awesome information. I've shot a .270 for my whole hunting life, and have never had a .25-06. I'm excited to push it to about 600 yards. the bullets seemed to be better suited for up to 600 yards then the .270...What kinda performance can i expect?
Nimrod
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  #13  
Old 08-25-2011, 12:10 AM
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Join Date: Apr 2010
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Re: Why is the 25-06 slower then the 30-06 with the same Bullet weight?

The bearing surface doesn't increase that much as the bore diameter is smaller so the
circumference is smaller. It has more to do with being able to burn the powder quicker
and have a larger bullet diameter to push against. Remember the pressures allowable
are around 63,000 lbs per square inch. .125x.125 x 3.1416 = .0490875 .154x.154 x 3.1416 = .07451 . That is 66% more surface area if I didn't screw up.
the 25 06 will yield up to 3092 lbs pushing on the bullet and the .308 caliber up to
4694 lbs assuming a 63000 lb max pressure. So the more powder you want to burn
behind a smaller bullet the longer the barrel you need to utilize it, as the powder will need to burn slower to keep pressures down,
everything else being equal. Very simplistic but about as far as my math skills allow.
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