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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm vs. .30 cal
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<blockquote data-quote="Hired Gun" data-source="post: 158501" data-attributes="member: 1290"><p>I don't know that I would call the 300 Ultra efficient at all. I can run about right with it with 10 grain less powder with my 300Wby. I shoot 180's at 3300 with 85 grain of powder and 200 grain Accubonds at 3100 with 83 grains. No extractor marks and 20 plus firings for case life. </p><p></p><p>The reason the bigger bore gets it's velocity easier with the same weight bullet is the bottom of the bullet has more area to push on and has less weight per square inch of area. A 308 bullet base area is .0744682 square inches. A 7mm has and area of .0633149 sqaure inches. With the same amount of pressure acting on the bottom of the bullets base the bigger one will support more weight. A larger diameter piston makes more power. Same reason NHRA Pro Stock engines have a very large bores. </p><p></p><p>I started this post this morning but had to go shooting. Sorry for the delay.</p></blockquote><p></p>
[QUOTE="Hired Gun, post: 158501, member: 1290"] I don't know that I would call the 300 Ultra efficient at all. I can run about right with it with 10 grain less powder with my 300Wby. I shoot 180's at 3300 with 85 grain of powder and 200 grain Accubonds at 3100 with 83 grains. No extractor marks and 20 plus firings for case life. The reason the bigger bore gets it's velocity easier with the same weight bullet is the bottom of the bullet has more area to push on and has less weight per square inch of area. A 308 bullet base area is .0744682 square inches. A 7mm has and area of .0633149 sqaure inches. With the same amount of pressure acting on the bottom of the bullets base the bigger one will support more weight. A larger diameter piston makes more power. Same reason NHRA Pro Stock engines have a very large bores. I started this post this morning but had to go shooting. Sorry for the delay. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm vs. .30 cal
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