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Old 06-04-2020, 03:13 AM   #1
Matelle
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Default 7.62 Yawing and Velocity

May be a bit of a niche question, haven't seen anyone else pose it, but can't hurt to ask. For 7.62x39 bullets like Yugo M67, Golden Tiger, etc, that are known for their tendency to yaw on impact, is that yawing dependent upon velocity to any great extent?
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Old 06-04-2020, 06:19 AM   #2
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i dont think so, to me it seems its just because the bullet is short
er compared to a 308 or 762x54.
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Old 06-04-2020, 10:18 PM   #3
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I'd like to think it's more projectile design that might not be velocity dependent.
Balance, ogive, ballistic coefficients, rate of twist, etc.
You'd be better off asking some bullet manufacturers. Hornady might even be good to contact their tech guys.
There's a science behind everything. Science is wonderful. Some folks get paid big $$ to engineer or make the science. Some might call it magic. But you and I living in the real world know there is no such thing as "magic".
Well designed killing machines is what humans beings specialize in. Perfecting the kill and how to kill each other more efficiently (effectively).
IMO, yaw and spin imparted on a projectile in flight or upon contact with media could possibly amplify terminal ballistics above and beyond a projectile drilling a perfect caliber size hole through the target.
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Old 06-05-2020, 01:06 AM   #4
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You might check online (youtube, e.g.) for gel-tests with short-barrels.
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Old 06-05-2020, 08:13 PM   #5
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Quote:
Originally Posted by Ram Rod View Post
I'd like to think it's more projectile design that might not be velocity dependent.
Balance, ogive, ballistic coefficients, rate of twist, etc.
You'd be better off asking some bullet manufacturers. Hornady might even be good to contact their tech guys.
There's a science behind everything. Science is wonderful. Some folks get paid big $$ to engineer or make the science. Some might call it magic. But you and I living in the real world know there is no such thing as "magic".
Well designed killing machines is what humans beings specialize in. Perfecting the kill and how to kill each other more efficiently (effectively).
IMO, yaw and spin imparted on a projectile in flight or upon contact with media could possibly amplify terminal ballistics above and beyond a projectile drilling a perfect caliber size hole through the target.
I love science.
You don't want the yaw imparted on a projectile while in flight. That will lead to some very poor accuracy. You want the yaw after impact when the projectile slows enough that the spin rate is not enough to keep it stable. The higher the velocity the slower twist rate is needed to stabilize the bullet. As it slows, for example once it drops below the speed of sound, bullets will often become unstable in flight and begin to yaw resulting in very poor accuracy. Even a very slight yaw will result in poor accuracy.
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Old 06-06-2020, 03:05 AM   #6
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Flat base bullets typically yaw sooner and more than boat tail bullets when they impact tissue that is denser than air.

It is easier to make accurate flat base bullets than accurate boat tail bullets.

Making economical accurate bullets is what mainly caused some countries to make flat base military AK bullets.

Much more recently, in 1995, a lead core flat base bullet was developed in Russia for police and military fo urban use.

The theory behind their design is flat base bullet ricochets less than a boat tail bullet and a lead core bullet ricochets less than a steel core bullet.

The original AK bullets were steel core boat tail bullets because they were meant to replace 7.62x54R bullets and were required to penetrate a steel helmet at 1000 meters.

The boat tail helps maintain velocity and the steel core helps penetration.

Non-expanding boat tail bullets at AK bullet weight and velocity do not usually cause wound damage as great as more powerful rifle cartridges and the wounds are often compared to handgun bullets.

The flat base 7.62 bullets do significantly increase wound volume at AK bullet weight and velocity.

Yaw and tumble do help 7.62 bullets, but do little to help non-expanding 5.45 and 5.56 bullets with their smal size and weight, even with greater velocity.

Note that that wound volumes caused by tumbling 5.45 bullets were compared with boat tail 7.62 bullets, not flat base 7.62 bullets.
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