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Hunting
Extreme Long Range Hunting & Shooting (ELR)
50 BMG Barrel life?
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<blockquote data-quote="wildcat455" data-source="post: 1473700" data-attributes="member: 102653"><p>The math would indicate differently, so I'm posting it up for consideration.</p><p></p><p>Cartridge overbore index ratio comparison:</p><p></p><p>Cartridge Case capacity bore area overbore ratio</p><p>26 Nosler 99 .05723 1730</p><p>28 Nosler 99 .06261 1581</p><p>50BMG 300 .20093 1493</p><p>7/300 WM 92 .06261 1470</p><p>300 Norma 104 .07335 1418</p><p>30 Nosler 97 .07335 1322</p><p>300 WM 94 .07335 1282</p><p>338 LM 113 .08813 1282</p><p>30-06 68 .07335 927</p><p></p><p>Search cartridge overbore calculation for more.</p><p></p><p>To find your cartridge's overbore index ratio: </p><p>(Not sure why I'm typing this, no one will probably do it.. it's MATH!! LOL!)</p><p></p><p>Measure the water volume in grains of a fired case from your rifle, or if already known, (google is your friend, Chuck hawk's lists some common capacities) use that value.</p><p></p><p>If the caliber of your cartridge happens to be one of the above, use the number under the heading "bore area" for your caliber. If you've got this number, you can skip to the bottom. ***</p><p></p><p>If not, Whip out your calculator, or app on your phone.</p><p></p><p>Use the diameter of your bore to find the radius of your bore. R=D/2 (so divide the diameter of your bore by 2, resulting number is the radius of your bore.) </p><p></p><p> Then use the formula for area of a circle to find the bore area, which is A=pi x (RxR) </p><p>Spoken, this formula is stated:</p><p></p><p>Area equals pi R squared </p><p></p><p>First multiply your bore radius times itself, multiply that times pi, the product is the area of your bore. </p><p></p><p>*** Now, divide the case capacity number by the area number. The quotient is your overbore index ratio.</p></blockquote><p></p>
[QUOTE="wildcat455, post: 1473700, member: 102653"] The math would indicate differently, so I'm posting it up for consideration. Cartridge overbore index ratio comparison: Cartridge Case capacity bore area overbore ratio 26 Nosler 99 .05723 1730 28 Nosler 99 .06261 1581 50BMG 300 .20093 1493 7/300 WM 92 .06261 1470 300 Norma 104 .07335 1418 30 Nosler 97 .07335 1322 300 WM 94 .07335 1282 338 LM 113 .08813 1282 30-06 68 .07335 927 Search cartridge overbore calculation for more. To find your cartridge's overbore index ratio: (Not sure why I'm typing this, no one will probably do it.. it's MATH!! LOL!) Measure the water volume in grains of a fired case from your rifle, or if already known, (google is your friend, Chuck hawk's lists some common capacities) use that value. If the caliber of your cartridge happens to be one of the above, use the number under the heading "bore area" for your caliber. If you've got this number, you can skip to the bottom. *** If not, Whip out your calculator, or app on your phone. Use the diameter of your bore to find the radius of your bore. R=D/2 (so divide the diameter of your bore by 2, resulting number is the radius of your bore.) Then use the formula for area of a circle to find the bore area, which is A=pi x (RxR) Spoken, this formula is stated: Area equals pi R squared First multiply your bore radius times itself, multiply that times pi, the product is the area of your bore. *** Now, divide the case capacity number by the area number. The quotient is your overbore index ratio. [/QUOTE]
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50 BMG Barrel life?
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