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Hunting
Long Range Hunting & Shooting
Why is the 25-06 slower then the 30-06 with the same Bullet weight?
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<blockquote data-quote="Loner" data-source="post: 539818" data-attributes="member: 24560"><p>The bearing surface doesn't increase that much as the bore diameter is smaller so the</p><p>circumference is smaller. It has more to do with being able to burn the powder quicker</p><p>and have a larger bullet diameter to push against. Remember the pressures allowable</p><p>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. </p><p>the 25 06 will yield up to 3092 lbs pushing on the bullet and the .308 caliber up to</p><p>4694 lbs assuming a 63000 lb max pressure. So the more powder you want to burn</p><p>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,</p><p> everything else being equal. Very simplistic but about as far as my math skills allow.</p></blockquote><p></p>
[QUOTE="Loner, post: 539818, member: 24560"] 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. [/QUOTE]
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Long Range Hunting & Shooting
Why is the 25-06 slower then the 30-06 with the same Bullet weight?
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