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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="Calamity" data-source="post: 2178428" data-attributes="member: 112048"><p>UCZO: Thanks for your comment of cross section area. Intrigued by your post, I calculated the difference in cross-section area and found that it is 0.011 square inch. That is the diameter if a straight pin. A pencil lead is four times larger. I don't think that is significant enough to make a difference.</p><p>Hand Skills: Thanks for the graph table. That is helpful. It looks like the two calibers produce similar size wound channels (50mm) if the bullets are the same mass and velocity (175/180 gr@2880-2920 fps). So, Calvin45 has a point, too, the heavier 30 cal bullets (220 gr) produce wider wound channels, and it probably has to do with bullet construction and the lengthier bullets having more mass to produce a larger mushroom. That is fairly obvious if one thinks about the difference in energy say between a 750 gr .50 BMG round and a 50 gr .223 round both traveling at 2800 fps. But what would a 750 gr .223 round do? It would be a lead arrow, and if it were soft lead, it would likely exit the animal the size of a soft ball. Anyway, my supposition was, and remains, that 7mm and .30 cal bullets of the same weight and impact velocity should perform pretty much the same with regard to terminal effects on game, assuming equal bullet design. The 7mm would have a higher SD, and likely have greater penetration, but both should produce very similar degree of wounding, shot placement being equal. It would be instructive to find out if bullets of equal SD would behave the same. It would be interesting to test this in gelatin or potters clay.</p></blockquote><p></p>
[QUOTE="Calamity, post: 2178428, member: 112048"] UCZO: Thanks for your comment of cross section area. Intrigued by your post, I calculated the difference in cross-section area and found that it is 0.011 square inch. That is the diameter if a straight pin. A pencil lead is four times larger. I don't think that is significant enough to make a difference. Hand Skills: Thanks for the graph table. That is helpful. It looks like the two calibers produce similar size wound channels (50mm) if the bullets are the same mass and velocity (175/180 gr@2880-2920 fps). So, Calvin45 has a point, too, the heavier 30 cal bullets (220 gr) produce wider wound channels, and it probably has to do with bullet construction and the lengthier bullets having more mass to produce a larger mushroom. That is fairly obvious if one thinks about the difference in energy say between a 750 gr .50 BMG round and a 50 gr .223 round both traveling at 2800 fps. But what would a 750 gr .223 round do? It would be a lead arrow, and if it were soft lead, it would likely exit the animal the size of a soft ball. Anyway, my supposition was, and remains, that 7mm and .30 cal bullets of the same weight and impact velocity should perform pretty much the same with regard to terminal effects on game, assuming equal bullet design. The 7mm would have a higher SD, and likely have greater penetration, but both should produce very similar degree of wounding, shot placement being equal. It would be instructive to find out if bullets of equal SD would behave the same. It would be interesting to test this in gelatin or potters clay. [/QUOTE]
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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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