Bullet Stability
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- Опубліковано 14 чер 2023
- Welcome to the Ron Spomer Outdoors Podcast! In this episode, I talk about bullet stability.
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Who is Ron Spomer
For 44 years I’ve had the good fortune to photograph and write about my passion - the outdoor life. Wild creatures and wild places have always stirred me - from the first flushing pheasant that frightened me out of my socks in grandpa’s cornfield to the last whitetail that dismissed me with a wag of its tail. In my attempts to connect with this natural wonder, to become an integral part of our ecosystem and capture a bit of its mystery, I’ve photographed, hiked, hunted, birded, and fished across much of this planet. I've seen the beauty that everyone should see, survived adventures that everyone should experience. I may not have climbed the highest mountains, canoed the wildest rivers, caught the largest fish or shot the biggest bucks, but I’ve tried. Perhaps you have, too. And that’s the essential thing. Being out there, an active participant in our outdoor world.
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Disclaimer
All loading, handloading, gunsmithing, shooting and associated activities and demonstrations depicted in our videos are conducted by trained, certified, professional gun handlers, instructors, and shooters for instructional and entertainment purposes only with emphasis on safety and responsible gun handling. Always check at least 3 industry handloading manuals for handloading data, 2 or 3 online ballistic calculators for ballistic data. Do not modify any cartridge or firearm beyond what the manufacturer recommends. Do not attempt to duplicate, mimic, or replicate anything you see in our videos. Firearms, ammunition, and constituent parts can be extremely dangerous if not used safely.
Keep in mind viewers that stability is a relative term to an application when discussing bullets. Generally speaking Spomer does a great job, even better when viewers are specifically specific.
It start looking like a wobbly football is the easiest explanation
It would be interesting to compare the density of different bullet materials and their effects on bullet stability and ballistic coefficient. The spin rate required for stability is not solely dependent on length, and surely the difference between copper, lead/steel hybrid, pure lead, & lead/tungsten is an interesting spin (no pun intended) on what really constitutes the dynamics that play into ballistic coefficient and stability.
Great explanation of bullet stability Ron! Thanks for the professional and accurate information!
The top was a good analogy. I enjoyed this.
Great video Ron
Stability is directly related to rotational inertia of bullet, a hollow cylinder would have a higher rotational inertia than a solid cylinder having the same mass. So pulling a higher density sleeve in a bullet would generate a better stability but exactly how this would effect the bullet on impact is another question. It would be interesting to check the density in a radial direction of a bullet with a high BC.
The front won’t be rotating around while the base is stable. They will both be rotating around the center of gravity of the bullet.
I grew up with the 'cone of mathematical expansion of the group' from exiting the muzzle. One inch at 100, 2 inch at 200, etc. I oh so wish I could recall the article in a Field and Stream or Outdoor Life years ago when an article tested the theory of a high BC bullet 'going to sleep' beyond the 100 yard mark and producing the same or smaller groups at 200. Please don't hold me to the cartridges but I vividly remember a 140grain 6.5x55 and a 7mm rem mag. One inch 100 yard groups turned into half moa groups at 200. I have personal experience with a PPU 139sp, PMC144 6.5x55 out of my mauser step barrel 1908 m38 that was sporterized. Same action and military trigger with the 23 inch barrel. One inch three round groups at 100 turn into half moa groups at 200. Not a fluke. I asked other members at the range who knew how to shoot to try the various ammo and the rifle. Same results.
Ron left out the velocity factor, which is just as important as bullet length and twist rate. For example, there is a sweet spot for loading 300 Blackout subsonic. The long heavy bullet may be fine at 1050fps, but slowing it down to 900 may cause wobbling and keyholing.
Noe ya got me interested - What is the math formula for this? Thanks
Wait a minute! The harpoon gun used in JAWS didn't keyhole and it was like a 50 thousand grain 223 bullet. Hmmm.😮
Is it possible to spin a bullet too fast?
Has anyone ever had personal experience with keyholing? Nope. Nobody is dumb enough to load a 200 grain bullet in a standard twist 243....