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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
7mm or 30 cal? Just for curiosity’s sake
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<blockquote data-quote="Paladin300" data-source="post: 2177052" data-attributes="member: 115299"><p>First, fhe fraction of an inch you mentioned, that fingernails difference in diameter makes a big difference, when the bullet opens up on impacted that difference doubles. Second 7mm and 308 bullets of the same weight are not ballistically the same. They have completely different SDs which also make a difference on how they perform on game. While it has been argued that you can shoot as far with a 7mm and hit as hard that is not actually scientifically true. It takes more energy and thus more powder to push a 180 gr. 7mm out of a barrel than it does a 180 gr. 30 cal as there is less barring surface. Thus, a 30 cal is more efficient with heavier bullets than a 7mm. 180 grain 7mm is more comparable to a 200 grain or larger 30 cal. Therefore, the 30 cal retains more weight and energy and opens up larger creating a greater wound channel down range than a 7mm. As far as BC goes when you compare the right bullet weights it is negligible and for what would be considered LRH hunting ranges inside a 1000 yards really almost moot. The sevens fly a little flatter but the 30s hit with more energy. It is simple physics. I like both but when hunting big toothy critters I'll take the 30s.<img class="smilie smilie--emoji" loading="lazy" alt="🤔" title="Thinking face :thinking:" src="https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f914.png" data-shortname=":thinking:" /></p></blockquote><p></p>
[QUOTE="Paladin300, post: 2177052, member: 115299"] First, fhe fraction of an inch you mentioned, that fingernails difference in diameter makes a big difference, when the bullet opens up on impacted that difference doubles. Second 7mm and 308 bullets of the same weight are not ballistically the same. They have completely different SDs which also make a difference on how they perform on game. While it has been argued that you can shoot as far with a 7mm and hit as hard that is not actually scientifically true. It takes more energy and thus more powder to push a 180 gr. 7mm out of a barrel than it does a 180 gr. 30 cal as there is less barring surface. Thus, a 30 cal is more efficient with heavier bullets than a 7mm. 180 grain 7mm is more comparable to a 200 grain or larger 30 cal. Therefore, the 30 cal retains more weight and energy and opens up larger creating a greater wound channel down range than a 7mm. As far as BC goes when you compare the right bullet weights it is negligible and for what would be considered LRH hunting ranges inside a 1000 yards really almost moot. The sevens fly a little flatter but the 30s hit with more energy. It is simple physics. I like both but when hunting big toothy critters I’ll take the 30s.🤔 [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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7mm or 30 cal? Just for curiosity’s sake
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