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Rifles, Reloading, Optics, Equipment
Reloading
140 gr for a 30-06
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<blockquote data-quote="gonehuntingagain" data-source="post: 58434" data-attributes="member: 1206"><p>By running out of steam, I mean that the lighter bullet will not have as many foot-pounds of energy at long range. Initially, a lighter bullet may have more energy due to the higher velocity. Heavier bullets also tend to have a higher ballistic coefficient which helps downrange as well.</p><p></p><p>Using the JBM ballistics calculations, and Nosler's BC for a 150gr @ 3000fps and a 125gr bullet @3200fps (reasonable for a 30-06) and keeping all things equal, the 150 gr bullet still has more energy at the muzzle, but at 1000 yards, has over even more footlbs of energy, and its drop is about the LESS at that distance. The difference in these numbers will change depending on what bullet is used according to its BC. If you got a 125gr bullet that had a BC equivalent to a heavier bullet, then the lighter bullet would be better due to the higher BC + higher velocity. Heavier bullets also tend to buck the wind better as well. Looking at the chart that I made on the JBM site, the differences between the 125 gr BT and the 150 accubond are pretty good towards the 150gr, especially for wind drift and energy. Not sure why the 1000 yard drop said zero....I also don't know anyone that makes a 140gr 30cal bullet to use as an apples to apples comparison.</p><p> </p><p>125gr Nosler BT</p><p>Range Velocity Energy Drop Windage Time</p><p>(yards) (ft/sec) (ft-lbs)(inches)(inches)(sec)</p><p>0 3200 2842 -1.5 0 0</p><p>100 2924.6 2373.9 33.6 0.8 0.098</p><p>200 2665.5 1972 64.5 3.2 0.206</p><p>300 2421.6 1627.6 90.6 7.5 0.324</p><p>400 2191.9 1333.4 110.7 13.9 0.454</p><p>500 1973.9 1081.4 123.6 22.8 0.598</p><p>600 1770.1 869.6 127.5 34.6 0.759</p><p>700 1582.1 694.7 120.2 49.6 0.938</p><p>800 1412.9 554 99 68.5 1.139</p><p>900 1267.5 445.9 60.4 91.5 1.364</p><p>1000 1149.6 366.8 0 118.8 1.613</p><p></p><p></p><p>For the 150 gr bullet </p><p>Range Velocity Energy Drop Windage Time</p><p>(yards) (ft/sec)(ft-lbs)(inches)(inches)(sec)</p><p>0 3000 2997.5 -1.5 0 0</p><p>100 2777.2 2568.8 33.2 0.7 0.104</p><p>200 2565.5 2192.1 63.3 2.9 0.216</p><p>300 2364.2 1861.6 88.2 6.7 0.338</p><p>400 2172.7 1572.2 106.8 12.4 0.471</p><p>500 1989.4 1318.1 118 20.2 0.615</p><p>600 1815.9 1098.3 120.4 30.4 0.773</p><p>700 1653.5 910.6 112.2 43.3 0.946</p><p>800 1503.2 752.6 91.3 59.2 1.137</p><p>900 1367.7 623 55 78.5 1.346</p><p>1000 1250.1 520.5 0 101.3 1.576</p></blockquote><p></p>
[QUOTE="gonehuntingagain, post: 58434, member: 1206"] By running out of steam, I mean that the lighter bullet will not have as many foot-pounds of energy at long range. Initially, a lighter bullet may have more energy due to the higher velocity. Heavier bullets also tend to have a higher ballistic coefficient which helps downrange as well. Using the JBM ballistics calculations, and Nosler's BC for a 150gr @ 3000fps and a 125gr bullet @3200fps (reasonable for a 30-06) and keeping all things equal, the 150 gr bullet still has more energy at the muzzle, but at 1000 yards, has over even more footlbs of energy, and its drop is about the LESS at that distance. The difference in these numbers will change depending on what bullet is used according to its BC. If you got a 125gr bullet that had a BC equivalent to a heavier bullet, then the lighter bullet would be better due to the higher BC + higher velocity. Heavier bullets also tend to buck the wind better as well. Looking at the chart that I made on the JBM site, the differences between the 125 gr BT and the 150 accubond are pretty good towards the 150gr, especially for wind drift and energy. Not sure why the 1000 yard drop said zero....I also don't know anyone that makes a 140gr 30cal bullet to use as an apples to apples comparison. 125gr Nosler BT Range Velocity Energy Drop Windage Time (yards) (ft/sec) (ft-lbs)(inches)(inches)(sec) 0 3200 2842 -1.5 0 0 100 2924.6 2373.9 33.6 0.8 0.098 200 2665.5 1972 64.5 3.2 0.206 300 2421.6 1627.6 90.6 7.5 0.324 400 2191.9 1333.4 110.7 13.9 0.454 500 1973.9 1081.4 123.6 22.8 0.598 600 1770.1 869.6 127.5 34.6 0.759 700 1582.1 694.7 120.2 49.6 0.938 800 1412.9 554 99 68.5 1.139 900 1267.5 445.9 60.4 91.5 1.364 1000 1149.6 366.8 0 118.8 1.613 For the 150 gr bullet Range Velocity Energy Drop Windage Time (yards) (ft/sec)(ft-lbs)(inches)(inches)(sec) 0 3000 2997.5 -1.5 0 0 100 2777.2 2568.8 33.2 0.7 0.104 200 2565.5 2192.1 63.3 2.9 0.216 300 2364.2 1861.6 88.2 6.7 0.338 400 2172.7 1572.2 106.8 12.4 0.471 500 1989.4 1318.1 118 20.2 0.615 600 1815.9 1098.3 120.4 30.4 0.773 700 1653.5 910.6 112.2 43.3 0.946 800 1503.2 752.6 91.3 59.2 1.137 900 1367.7 623 55 78.5 1.346 1000 1250.1 520.5 0 101.3 1.576 [/QUOTE]
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140 gr for a 30-06
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