Twist rate and penetration: also factors effecting penetration and wound channels in general

[Formidilosus]

If a bullet reliably tumbles and fragments every time, and creates consistent wound channels, I see no problem with it. I would want a large sample and I doubt this is the case, even with Bergers.

I forget the thread, perhaps the 223 thread, but it is discussed how the nose on Bergers reliably collapses, which is why the are consistent. Other match BTHP bullets have a different tip construction and depend on tumbling, which is why they give inconsistent performance.

Notice, not a single recommend bullet in the 223 thread depends on tumbling to initiate fragmentation.

Bergers yaw (tumble) frequently- especially below +/- 2,400fps impact. Below around 2,000fps impact often they don’t fragment heavily.
Almost all (nearly all) HPBT bullets yaw, and if with sufficient velocity- fragment. Yawing, in general, is not as consistent for most bullets as conventional upset. However, when a bullet does consistently yaw early in tissue, wounding is very good.

 

[ElPollo]

Bergers yaw (tumble) frequently- especially below +/- 2,400fps impact. Below around 2,000fps impact often they don’t fragment heavily.
Almost all (nearly all) HPBT bullets yaw, and if with sufficient velocity- fragment. Yawing, in general, is not as consistent for most bullets as conventional upset. However, when a bullet does consistently yaw early in tissue, wounding is very good.

Form—The nose ringed DTAC bullets seem to work on the same model as Bergers and Scenars where the yaw causes the tip to crush or detach and initiate fragmentation. What do you think separates the performance characteristics of these bullets? Is it an issue of how readily the tip deforms or detaches, the jacket thickness, something about the shape that induces yaw, or a combination of those factors? Is greater velocity the primary reason why you are opting to use bullets of this type in 6 mms? Do you think there is a velocity threshold where this type of bullet excels over the plastic tip bullets like the ELDM and TMK?

 

[Mountainrancher]

Bergers yaw (tumble) frequently- especially below +/- 2,400fps impact. Below around 2,000fps impact often they don’t fragment heavily.
Almost all (nearly all) HPBT bullets yaw, and if with sufficient velocity- fragment. Yawing, in general, is not as consistent for most bullets as conventional upset. However, when a bullet does consistently yaw early in tissue, wounding is very good.

Are you referring to all bergers or just the “non” hunting ones? Does the thinner jacket of the hunting bergers allow for more conventional upset/expansion from the front expanding or are they yawing to create fragmentation as well

 

[Formidilosus]

Are you referring to all bergers or just the “non” hunting ones? Does the thinner jacket of the hunting bergers allow for more conventional upset/expansion from the front expanding or are they yawing to create fragmentation as well

Yes to all. Sometimes the nose collapses or shears off and they fragment from the front, sometimes they yaw and then fragment. And it’s all Bergers. The thin jacketed VLD and Hunting ones fragment at a lower velocity than the thicker jacketed target ones.

 

[Mountainrancher]

Yes to all. Sometimes the nose collapses or shears off and they fragment from the front, sometimes they yaw and then fragment. And it’s all Bergers. The thin jacketed VLD and Hunting ones fragment at a lower velocity than the thicker jacketed target ones.

Makes sense thank you for the reply form