8.6 BLK OUT 1 in 3 Barrel Twist in other cartridges

[Bearcat1982]

The barrel twist in this cartridge seems to be what's helping make the magic sorta speak as has been told to me VIA YouTubers Ive been listening to. Does anyone have any insight on how this could work in other calibers and cartridges? Say in a heavy slow moving, but spinning fast 44 magnum? Just thought that twist rate was interesting, first of its kind that I know of.

 

[Varminterror]

44 magnum uses stubby bullets which are fully stabilized in rather slow twist rates. Unless you loaded some kind of super long, maybe 2” long, 500+ grain spitzer, a fast twist in a 44mag would not be beneficial.

 

[BreechFace]

I think he’s referring to the magical blender effect Kevin Brittingham suggests occurs with high RPM impact where the expanded bullets rotational speed does extras damage on target.

I’m more of a help the bullet do work either through rapid fragmentation or controlled expansion kind of believer.

 

[Citadel99]

My understanding is the twist rate is what kept 8.6 from SAAMI certification which is a bummer.

 

[someguy2800]

I think he’s referring to the magical blender effect Kevin Brittingham suggests occurs with high RPM impact where the expanded bullets rotational speed does extras damage on target.

I’m more of a help the bullet do work either through rapid fragmentation or controlled expansion kind of believer.

A big part of it too is that the centrifugal force makes copper bullets expand faster and at lower velocities. I don't think its going to do anything for controlled expansion lead bullets, but faster twist does help to get varmint bullets to fragment. I've noticed in the past that there is definitely a difference with like a 50gr Vmax out of a 1/8 or 1/7 compared to a 1/12

 

[someguy2800]

Its gonna be caliber and bullet specific. If you drive a certain bullet over a certain RPM it will spontaneously fly apart in mid air from centrifugal force. I have done it before with varmint bullets from long barreled 223's. If you push them too fast you will just see a puff 50 feet in front of the muzzle and nothing hits the target. This is why they tell you to only use solid copper bullets when you load 8.6 blackout supersonic and you are not supposed to exceed like 2200 fps because even pedals on the barnes bullets will fly open at a certain RPM. A lead 44 magnum bullet with its larger diameter and thin jacket would probably fly apart even at revolver velocities with a 1:3 twist.

 

[Bearcat1982]

what about other calibers though, and in a bullet designed for this. 338/8.6 can't be the only bullet diameter than can also gain something from, yes, the...Blender Effect
Theres something interesting happening there with 1 in 3 twist.

Yes 44 does use stubby bullets. Probably not make it a good candidate.

 

[Bearcat1982]

Im also not a hand loader so a lot of this well over my head if it wasn't obvious too. So I appreciate the free education Ive been getting here.

 

[Hunter 08]

The barrel twist in this cartridge seems to be what's helping make the magic sorta speak as has been told to me VIA YouTubers Ive been listening to. Does anyone have any insight on how this could work in other calibers and cartridges? Say in a heavy slow moving, but spinning fast 44 magnum? Just thought that twist rate was interesting, first of its kind that I know of.

Bullet construction is paramount to being able to handle the half million revolutions per minute done by a 1:3 twist. Other standard bullets just break apart from what others have said.

 

[Varminterror]

what about other calibers though, and in a bullet designed for this. 338/8.6 can't be the only bullet diameter than can also gain something from, yes, the...Blender Effect
Theres something interesting happening there with 1 in 3 twist.

Yes 44 does use stubby bullets. Probably not make it a good candidate.

This principle would only apply to a cartridge which utilized bullets sufficiently long to let the opening of the tip really impart centrifugal force to further open the petals MORE than the simple hydraulic action forcing the tip to open. 300blk could certainly be a candidate, but really, any spitzer can be. @someguy2800 mentioned the application where we've done this for generations with fast twist 22 (and 17 and 20) varmint cartridges - we just have to spin a lot harder to get the same influence on stiffer monometal bullets, and especially twist rifles a lot faster when the MV is only 1000-2200fps.

Ultimately, all of the disadvantages of the 8.6 Blackout are why we don't do this more commonly, as they dramatically outweigh the advantages of the "blender effect."