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Long Range Hunting & Shooting
Newbie Looking For Advice... 270 or 308
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<blockquote data-quote="Michael Eichele" data-source="post: 1139670" data-attributes="member: 1007"><p>1.11 is stable. Stable is stable. Anything above 1.0 is stable.</p><p></p><p>While there maybe more yaw in the beginning with 1.11 versus a 1.5 SG (and it will last a bit further downrange), it will eventually settle down. As a general rule, a bullet's stability will increase over time until it gets knocked around by the effects of it nearing the subsonic range and transitioning into the subsonic zone. Some bullets will survive it and some wont and the list of factors that determine this is long and complicated but the fact that it started out with a 1.5 SG or 2.0 for that matter doesn't automatically mean it will survive the transition.</p><p></p><p>SG is for 'Gyroscopic Stability'</p><p></p><p>What a hunter doesn't want is to develop a load in the summer at high altitude that is stable on the lower end of the spectrum and then go somewhere at low elevation in cold temps only to find that it isn't stable there. For example, you could live at 5000' and develop a 210ABLR in a 12x barrel during the summer at 60 degrees which will yield about a 1.3 SG which is more than adequate. Then, go to sea level in 0 degrees and the SG is under 1.0 which is completely unstable. Personally, I live and shoot less than 100' above sea level and do much of my development in the winter. If I'm punching clean round holes at 100 and 300 yards, I know that any hunt I will be on I will have adequate stability. I have found by trying to push the edge of twists using heavier bullets that when it is mathematically around that 1.0 mark, bullets keyhole at 100 yards.</p></blockquote><p></p>
[QUOTE="Michael Eichele, post: 1139670, member: 1007"] 1.11 is stable. Stable is stable. Anything above 1.0 is stable. While there maybe more yaw in the beginning with 1.11 versus a 1.5 SG (and it will last a bit further downrange), it will eventually settle down. As a general rule, a bullet's stability will increase over time until it gets knocked around by the effects of it nearing the subsonic range and transitioning into the subsonic zone. Some bullets will survive it and some wont and the list of factors that determine this is long and complicated but the fact that it started out with a 1.5 SG or 2.0 for that matter doesn't automatically mean it will survive the transition. SG is for 'Gyroscopic Stability' What a hunter doesn't want is to develop a load in the summer at high altitude that is stable on the lower end of the spectrum and then go somewhere at low elevation in cold temps only to find that it isn't stable there. For example, you could live at 5000' and develop a 210ABLR in a 12x barrel during the summer at 60 degrees which will yield about a 1.3 SG which is more than adequate. Then, go to sea level in 0 degrees and the SG is under 1.0 which is completely unstable. Personally, I live and shoot less than 100' above sea level and do much of my development in the winter. If I'm punching clean round holes at 100 and 300 yards, I know that any hunt I will be on I will have adequate stability. I have found by trying to push the edge of twists using heavier bullets that when it is mathematically around that 1.0 mark, bullets keyhole at 100 yards. [/QUOTE]
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