Bullet Jackets, Materials, and Design
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- Опубликовано: 3 июн 2023
- Welcome to the Ron Spomer Outdoors Podcast! In this episode, I answer a listener's question about bullet jackets, materials, and design.
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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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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.
The Accubond Long Range bullets do have a slightly thinner jacket at the top half as compared to the standard Accubond bullet in a given weight. This is to allow the bullet to expand at lower velocities, 1300 fps, compared to 1800 fps.
Yes, the thinner jacket near the tip seems to be a common feature of "long range" bullets to make them effective at lower velocities and farther downrange.
Ron I concur with you 100% you don't need anything heavier in the 270 than 130 or 140gr bullet. With a 1/10 twist it is harder to stabilize longer heavier bullets
Bullet manufacturing has come along way. Cup and core still the old standard, bonded, and monolithic bullets their is so much out there and different states have different regulations on the type of bullets you can use
The nosler ab has tapered jacket i think+ bonding
Yes, but the taper is more extreme with the "Long Range" versions. The thinner jacket near the tip is why the opening velocity of Accubond Long Range bullets is 1300fps vs 1800 fps for the older version.
an interesting video might be about cartridge design, "ballon-ing cartridges", fireforming, and failure analysis.
First, its important to talk about cartdige design and what a cartdige actually does.
A cart is a high pressure bullet delivery device, where the case acts as mechanical seal for the high pressures. It does not "contain" the explosion per say bc the explosion would rupture the case in the open. The case seals the gases and expands to the walls, preventing gas blowby to your face.
Different materials have been used, but brass is a happy medium bc of its mechanical properties, like friction co-eff, percent of allowable stretch/elongation/strain, and spring back.
In order to determine analysis of when it will fail/ how thick to make the case, we rely on two factors, yield strength and % elongation. or the stress and strain.
since most of the time, chamber pressures are higher than the yeild strength of brass, we rely on such a tight fit between the cart and chamber. this allows for the chmaber wall to support the brass. when it stretches, or fireforms, if it stretches too much, it will fail. This is why some unsupported chambers have case head ruptures like a semi unsupports 40 sw chamber with extended feed ramps. Once it fully stretches it sticks to the chamber walls, and seals, using energy, and then the rear of the case stretches and contancts the bolt face. The case head seporation occurs at the junction where the brass no longer sticks to the chmaber and stretches to touch the bolt.
You will actually see a valley in the inside of the case.
When the case expands, a uniform "ending/chamber" pressure is desired to produce consistent loads. Some energy is dumped into the chamber walls by the brass, its friction allowing it to grab and seal. This means if you lube your case, it will chamber nicely, but wont stick to the walls, and seal as well. This results in 2-3x more bolt thrust, reducing lifespan by 4-8x on the low end. This is why its important for us handloaders to clean our case lube off.
When it comes to "match" grade chambers, the tolerances of the chamber and brass can be/are held to tighter standards, allowing for less stretch, more consistent pressures, increased case life, and increased bolt case life.
A really cool thing with cnc machines was that it brought hese barrels, and chambers to the regular consumer, at an affordable price, vs a hand lapped and fitted gun or actoin.
So when we get more consistent pressures, it lends itself to more consistent bullet velocities.
Hope this gives you some ideas!
couple typos and grammatical errors but hope u get the gist.
bolt face gets spanked instead of all of action/chamber when case is excessively lubed. or headspace excessive and why
Some long range are boat tailed and they have shown that for shots less then 300 yards that flat base bullets stabilize faster so can be more accurate at 300 yards or less!
Accubond long range does have a thinner jacket up front than the regular accubond, this helps it expand more at lower velocities. At long ranges the bullets impact velocities are less at long ranges.
Hey Ron not sure if you will see this but I've got a question for you that I can't seem to figure out. If I shoot Barnes hollow point bullets out of the 350 legend and my 50 Cal muzzleloader I can't get the bullets to mushroom. They just have the nose pushed in a bit but I know people who use these bullets n have awesome performance on deer. Just wondering what your thoughts are on using these and if my "target" material (very thin steel n dirt) has anything to do with it vs deer hide/ lungs?
Future pronghorn hunt. What distance is a reasonable shot so I may practice. I have a Ruger 7mm rem make. Can you recommend a budget friendly scope and a bullet for hand loading. Thank you.
You even have a reply to someone a year ago mentioning thinner jacket or softer lead in th ABLR vs the AB
I got one question the Foster slugs get shot out of shotgun smooth bore right. The cuts on the side make it spin right but I've seen 12g and 20g shot and I recovered from water. And the side was smooth with no signs of side grove on the Foster slugs. So what is the point of the grove on the side if they go away when shot.
He has talked about it before. It's made to crush into the bore for a better seal. Shotgun smooth bore barrels aren't necessarily that tight of tolerances, so they vary from gun to gun.
Hey Ron!? Please explain the "bonding " process. Is it molten lead pour? Is it adhesive? Is it some kind of hyper secret " I would tell you but then I'd have to kill you?" Thanks man.❤
Depends on the manufacturer, but there’s typically some kind of electro/chemical process that binds the jacket and core.
All of the above, Elgato. Some bonded bullets have the jacket glued to the core, some weld (solder) the jacket to the core (hot enough that they fuse together, as I understand it,) and some use a combination of chemicals and heat to bond the two materials at a molecular level. Finally, there is the plating system in which copper is electroplated to the lead core. And, yes, there are some proprietary process that, if told to you, would require you to be snuffed.
Priceless