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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Time for a new barrel
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<blockquote data-quote="Mysticplayer" data-source="post: 25181" data-attributes="member: 8947"><p>Tim, Don't mean to throw cold water on your idea but I don't think you are going to achieve the results you want.</p><p></p><p>First off, I think that your accuracy requirements are going to be pretty tough. If you look at 1000yd BR results in any calibre, most groups are in the 1/2 MOA range. That is under controlled conditions and wind flags. Backstops tend not to move either.</p><p></p><p>In the field, that will not be the case. Making a rifle capable of under 1/2MOA mechanical accuracy is a no brainer. Being able to shoot that is the problem. At the extended ranges you are looking for, one shot hits on such a small target are going to be more a question of statistical luck. Sort of like shooting a PD at 2 miles. Lob enough lead at the thing and you are going to hit it. Repeatable, predictable - no way.</p><p></p><p>Look at the smaller calibres like the 6, and 6.5 (maybe even the 7mm). There are now excellent VLD bullets that have BC very close to the 30 cals. The big difference is that with the smaller calibres, you can go much faster.</p><p></p><p>Wind drift is probably your biggest problem. Getting the bullet there faster will make a difference. Coyotes tend to not stand in one spot for very long.</p><p></p><p>Consider muzzle vel over 3300fps and see how much that reduces wind drift. If the bullets will stay together, going 3500fps is possible. Barrel life will suck but I don't think that is the point of this excercise.</p><p></p><p>Wildcats like the 6.5STW or 6WSM may be the answer.</p><p></p><p>The interest in the heavy big cal bullets is the performance on big game at extreme ranges. If going after smaller game, they give very little advantage.</p><p></p><p>Maybe looking at your goals from a different angle will give you a solution.</p><p></p><p>Jerry</p></blockquote><p></p>
[QUOTE="Mysticplayer, post: 25181, member: 8947"] Tim, Don't mean to throw cold water on your idea but I don't think you are going to achieve the results you want. First off, I think that your accuracy requirements are going to be pretty tough. If you look at 1000yd BR results in any calibre, most groups are in the 1/2 MOA range. That is under controlled conditions and wind flags. Backstops tend not to move either. In the field, that will not be the case. Making a rifle capable of under 1/2MOA mechanical accuracy is a no brainer. Being able to shoot that is the problem. At the extended ranges you are looking for, one shot hits on such a small target are going to be more a question of statistical luck. Sort of like shooting a PD at 2 miles. Lob enough lead at the thing and you are going to hit it. Repeatable, predictable - no way. Look at the smaller calibres like the 6, and 6.5 (maybe even the 7mm). There are now excellent VLD bullets that have BC very close to the 30 cals. The big difference is that with the smaller calibres, you can go much faster. Wind drift is probably your biggest problem. Getting the bullet there faster will make a difference. Coyotes tend to not stand in one spot for very long. Consider muzzle vel over 3300fps and see how much that reduces wind drift. If the bullets will stay together, going 3500fps is possible. Barrel life will suck but I don't think that is the point of this excercise. Wildcats like the 6.5STW or 6WSM may be the answer. The interest in the heavy big cal bullets is the performance on big game at extreme ranges. If going after smaller game, they give very little advantage. Maybe looking at your goals from a different angle will give you a solution. Jerry [/QUOTE]
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Time for a new barrel
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