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Ballistics G1 & G7
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<blockquote data-quote="Don A Parsons" data-source="post: 1336841" data-attributes="member: 97414"><p>So the puzzle is bullet selection.</p><p></p><p>6.5, 7mm, or 30 cal.</p><p></p><p>I see benefits and disadvantages in each.</p><p>The SD and BC play roles on these calibers as well as others, but looking at the bullets on the bench tells me very little.</p><p></p><p>The 6.5 143gr ELD-X bullet gets a G1 @ .625 & G7 @ .315</p><p></p><p>7mm 175gr ELD-X bullet gets a G1 @ .689 & G7 @ .347</p><p></p><p>30 Cal 175gr ELD-X bullet gets a G1 @ .535 & G7 @.271</p><p></p><p>Yes I know that they are different grain bullets, sectional density, diameter, length, and probably velocities.</p><p></p><p>Write up's mention that the smaller caliber bullets have less frontal area as larger bullets have more.</p><p></p><p>They say that the smaller bullets get better penitration because of this.</p><p></p><p>Is the few thousands of a inch in diameter from 6.5 too 30 caliber that big of a factor.</p><p></p><p>My mind in the close range harvest field tells me it's no big deal since all these calibers and others have harvested critters all around the world.</p><p></p><p>Maybe this BC thing has part too play in game harvests, but probably more so at long range.</p><p></p><p>So how much difference is too much.</p><p></p><p>I would think a semi pointed round nose will not perform like a full on pointed bullet,,, but when all the bullets are pointed,,, will they not be close too the same target grouping at 600M or 900M / 700 too 10000 yards.</p><p></p><p>How much difference in issues would there be from 6.5 G7 .315 too a 30 cal G7.271</p><p></p><p>My noodle tells me that at long distances like this so long as both bullets do not drop below sub sonic at 1130 ft-per second,,, or trans sonic at 1340 ft-per second.</p><p></p><p>I'm guessing that this G1 & G7 BC plays a bigger role when the above bullets fall into this category.</p><p></p><p>Even then, my mind tells me that both longer and heavier bullets work better at extra long distances in the 1000 too 16 or 1700m range /// 1100 too 1800 yards.</p><p></p><p>Or the mile too 2 mile stuff,,, not the 1000 yard category.</p><p></p><p>What am I missing, where is the info too compare BC G1 & G7 values between bullets.</p><p></p><p>Lots of post too go as I narrow down this puzzle with in my mind.</p><p></p><p>Don</p></blockquote><p></p>
[QUOTE="Don A Parsons, post: 1336841, member: 97414"] So the puzzle is bullet selection. 6.5, 7mm, or 30 cal. I see benefits and disadvantages in each. The SD and BC play roles on these calibers as well as others, but looking at the bullets on the bench tells me very little. The 6.5 143gr ELD-X bullet gets a G1 @ .625 & G7 @ .315 7mm 175gr ELD-X bullet gets a G1 @ .689 & G7 @ .347 30 Cal 175gr ELD-X bullet gets a G1 @ .535 & G7 @.271 Yes I know that they are different grain bullets, sectional density, diameter, length, and probably velocities. Write up's mention that the smaller caliber bullets have less frontal area as larger bullets have more. They say that the smaller bullets get better penitration because of this. Is the few thousands of a inch in diameter from 6.5 too 30 caliber that big of a factor. My mind in the close range harvest field tells me it's no big deal since all these calibers and others have harvested critters all around the world. Maybe this BC thing has part too play in game harvests, but probably more so at long range. So how much difference is too much. I would think a semi pointed round nose will not perform like a full on pointed bullet,,, but when all the bullets are pointed,,, will they not be close too the same target grouping at 600M or 900M / 700 too 10000 yards. How much difference in issues would there be from 6.5 G7 .315 too a 30 cal G7.271 My noodle tells me that at long distances like this so long as both bullets do not drop below sub sonic at 1130 ft-per second,,, or trans sonic at 1340 ft-per second. I'm guessing that this G1 & G7 BC plays a bigger role when the above bullets fall into this category. Even then, my mind tells me that both longer and heavier bullets work better at extra long distances in the 1000 too 16 or 1700m range /// 1100 too 1800 yards. Or the mile too 2 mile stuff,,, not the 1000 yard category. What am I missing, where is the info too compare BC G1 & G7 values between bullets. Lots of post too go as I narrow down this puzzle with in my mind. Don [/QUOTE]
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