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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Bullet stability
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<blockquote data-quote="MajorSpittle" data-source="post: 1952515" data-attributes="member: 53101"><p>But how do you account for variability of SD with each rifle/cartridge. All you can really do is take a sample among multiple rifles and say X% of rifles tested stabilized this cartridge with this spin rate under these conditions.</p><p></p><p>So you are always guessing as to what "off axis spin" to use as a baseline for Minimum Twist Rate needed.</p><p></p><p>So perhaps when software says a 208 LR Hybrid has poor stability in my 1/11 twist 30-06 at sea level launched at 2650fps, it doesn't account for me hand loading them in my rifle and finding the most accurate load that most likely has the least amount of off axis spin when launched which is why it is shooting .5 MOA at 200 yrds.</p><p></p><p>I don't see anyway to account for this and any calculator will just provide generic guidance on probability of being able to achieve stability or develop a load.</p><p></p><p>So in my case I get a 1.2 stability rating with a 9% reduction in BC for the above example. I would look at that as the odds are not good that I will find any over the counter box of ammo with that bullet to work well for LR shooting in my rifle at sea level; But I have a good chance to still be able to hand load and find a load that will do better than what the calculator shows because the SD variable used was probably developed by throwing the same load in multiple rifles that may or may not have "liked" the generic load used for testing.</p><p></p><p>Has anyone ever took a rifle that wouldn't stabilize a generic load with X bullet at sea level and develop a load for it that shoots great at 8,000ft. Then take that load back down to sea level and check to verify if it still wouldn't stabilize? If it does maybe a person could quantify the SD need to stabilize at a certain spin rate/altitude? Say, if you develop a load that shoots >1.2 MOA at 8,000ft with X RPMs, then that load will remain stable all the way to sea level with the reduction of FPS expected for the load at sea level?</p></blockquote><p></p>
[QUOTE="MajorSpittle, post: 1952515, member: 53101"] But how do you account for variability of SD with each rifle/cartridge. All you can really do is take a sample among multiple rifles and say X% of rifles tested stabilized this cartridge with this spin rate under these conditions. So you are always guessing as to what "off axis spin" to use as a baseline for Minimum Twist Rate needed. So perhaps when software says a 208 LR Hybrid has poor stability in my 1/11 twist 30-06 at sea level launched at 2650fps, it doesn't account for me hand loading them in my rifle and finding the most accurate load that most likely has the least amount of off axis spin when launched which is why it is shooting .5 MOA at 200 yrds. I don't see anyway to account for this and any calculator will just provide generic guidance on probability of being able to achieve stability or develop a load. So in my case I get a 1.2 stability rating with a 9% reduction in BC for the above example. I would look at that as the odds are not good that I will find any over the counter box of ammo with that bullet to work well for LR shooting in my rifle at sea level; But I have a good chance to still be able to hand load and find a load that will do better than what the calculator shows because the SD variable used was probably developed by throwing the same load in multiple rifles that may or may not have "liked" the generic load used for testing. Has anyone ever took a rifle that wouldn't stabilize a generic load with X bullet at sea level and develop a load for it that shoots great at 8,000ft. Then take that load back down to sea level and check to verify if it still wouldn't stabilize? If it does maybe a person could quantify the SD need to stabilize at a certain spin rate/altitude? Say, if you develop a load that shoots >1.2 MOA at 8,000ft with X RPMs, then that load will remain stable all the way to sea level with the reduction of FPS expected for the load at sea level? [/QUOTE]
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