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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
High BC Bullet Gap
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<blockquote data-quote="RockyMtnMT" data-source="post: 1179038" data-attributes="member: 7999"><p>I will try. </p><p></p><p>Here is what we have at this point. We have put some work into a .25 cal bullet because of the "Gap". We have not fully tested this bullet yet. I will give you what have at this point. 3000 fps is about where this bullet should run in a 25-06.</p><p></p><p>.257 dia</p><p>130 grains</p><p>1.51" long</p><p>G7 bc estimate of .281</p><p></p><p>This bullet is designed for a 1-7" twist barrel to give it full stability at sea level with an SG of 1.52.</p><p></p><p>If you are at 3000' elevation you could run this bullet with a 1-7.5" twist with an SG of 1.48.</p><p></p><p>Now realize that copper is of lower density than lead. So an all copper bullet will be longer for weight than a lead core bullet of the same form. If a lead core bullet of the same exact shape were made it would be heavier and thus have a higher bc. Physical weight is a large factor in bc. In comparison the mono bullet can be launched at higher velocities. So it kind of gets a head start. Eventually the heavier higher bc bullet will catch up. In this case probably about 700 yards (educated guess). But with a couple hundred ft/sec higher muzzle velocity the lighter bullet will give you quite a bit better point blank range. Meaning your effective hunting range with out making any adjustment for drop is significantly increased. Question now becomes how far do you think your effective hunting range is with a .25 cal bullet? That is up to the individual, but probably not much further than 700 yards.</p><p></p><p>So you guys that want a higher bc .25 can get it just say the word.</p><p></p><p>Steve</p></blockquote><p></p>
[QUOTE="RockyMtnMT, post: 1179038, member: 7999"] I will try. Here is what we have at this point. We have put some work into a .25 cal bullet because of the "Gap". We have not fully tested this bullet yet. I will give you what have at this point. 3000 fps is about where this bullet should run in a 25-06. .257 dia 130 grains 1.51" long G7 bc estimate of .281 This bullet is designed for a 1-7" twist barrel to give it full stability at sea level with an SG of 1.52. If you are at 3000' elevation you could run this bullet with a 1-7.5" twist with an SG of 1.48. Now realize that copper is of lower density than lead. So an all copper bullet will be longer for weight than a lead core bullet of the same form. If a lead core bullet of the same exact shape were made it would be heavier and thus have a higher bc. Physical weight is a large factor in bc. In comparison the mono bullet can be launched at higher velocities. So it kind of gets a head start. Eventually the heavier higher bc bullet will catch up. In this case probably about 700 yards (educated guess). But with a couple hundred ft/sec higher muzzle velocity the lighter bullet will give you quite a bit better point blank range. Meaning your effective hunting range with out making any adjustment for drop is significantly increased. Question now becomes how far do you think your effective hunting range is with a .25 cal bullet? That is up to the individual, but probably not much further than 700 yards. So you guys that want a higher bc .25 can get it just say the word. Steve [/QUOTE]
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High BC Bullet Gap
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