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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stabilization, strictly RPM?
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<blockquote data-quote="sambo3006" data-source="post: 168255" data-attributes="member: 2740"><p>Makes good sense. I hadn't thought about it enough to consider distance traveled per revolution based on velocity. A clean bullet release is also obviously very important. A buddy of mine found this out when he took it upon himself to shorten the barrel on his Ruger Super Redhawk without recrowning it and then couldn't figure out why his groups went to crap.</p><p></p><p>I have a 700 7mm RUM that shoots nice small groups around 0.5" or less at 100 yds with 150 gr BT's. I believe the factory twist is 1-10". I am thinking about putting a brake on it and making it my long range deer/prairie goat/elk rig. Sounds like it probably would not stabilize some of the heavier pills in the 180+ gr range. I would think the 160 gr AB would stabilize nicely, maybe the 168 gr VLD.</p><p></p><p>As an aside, does a longer more aerodynamic bullet require a faster rifling twist on average? Comparing say that same 6.5 mm 140 gr VLD with its listed BC of 0.64 and the 140 gr Sierra spitzer boat tail with a listed BC of around 0.49. Does it go back to the issue of the longer bullet being more prone to yaw?</p><p></p><p>Thanks for the excellent feedback, guys!</p><p></p><p>Sam</p></blockquote><p></p>
[QUOTE="sambo3006, post: 168255, member: 2740"] Makes good sense. I hadn't thought about it enough to consider distance traveled per revolution based on velocity. A clean bullet release is also obviously very important. A buddy of mine found this out when he took it upon himself to shorten the barrel on his Ruger Super Redhawk without recrowning it and then couldn't figure out why his groups went to crap. I have a 700 7mm RUM that shoots nice small groups around 0.5" or less at 100 yds with 150 gr BT's. I believe the factory twist is 1-10". I am thinking about putting a brake on it and making it my long range deer/prairie goat/elk rig. Sounds like it probably would not stabilize some of the heavier pills in the 180+ gr range. I would think the 160 gr AB would stabilize nicely, maybe the 168 gr VLD. As an aside, does a longer more aerodynamic bullet require a faster rifling twist on average? Comparing say that same 6.5 mm 140 gr VLD with its listed BC of 0.64 and the 140 gr Sierra spitzer boat tail with a listed BC of around 0.49. Does it go back to the issue of the longer bullet being more prone to yaw? Thanks for the excellent feedback, guys! Sam [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stabilization, strictly RPM?
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