More crap I don't need - 8.6 Blackout edition.

[LVLAaron]

We'll see how this one does.

 

[Stugots]

Aaron, how did your 8.6 Blkout McGowan barrel shoot for you? Would you please post your load data?

 

[LVLAaron]

8.6BLK LOAD DATA

docs.google.com

 

[LVLAaron]

Haven't put a ton of rounds through the McGowan but so far, I'd say it's good to go.

 

[Sniperhandle]

Haven't put a ton of rounds through the McGowan but so far, I'd say it's good to go.

So is that 6.5 twist?

I didn't think guys your age wore wrist watches! Haha

 

[ELR LVR]

Got the last piece I need to build an 8.6 blackout.

.338 1:3 twist.


I figured since Festivus is right around the corner, we could argue about the unnecessary twist rate.


View attachment 1503708

I did one for a guy recently, this was for a bolt gun though.
I was shocked by the twist rate as well
Ordered a 1:3 only because Faxon was the only place that had one "In stock" ready to ship
The barrel cut real nice, it cut like a Krieger
He was planning on using copper solids
--------------
I did a little research since that cartridge is new to me as well as such a tight twist rate
and from what I gathered that is the twist needed for subsonic speeds
With Heavies
So I suppose the 1:3 covers every scenario and that's whats most commonly offered.
Many other people use like a 1:6 and choose their bullet accordingly for that

 

[LVLAaron]

Mine are all bolt guns. I got a faxon 1:3 that I plan on using for a 338 arc. Best of both worlds? I'll find out.

 

[Stugots]

I did a little research since that cartridge is new to me as well as such a tight twist rate
and from what I gathered that is the twist needed for subsonic speeds
With Heavies
So I suppose the 1:3 covers every scenario and that's whats most commonly offered.
Many other people use like a 1:6 and choose their bullet accordingly for that

Not true. I have a cut rifled McGowen 16" x 1.2" straight 6.5 twist barrel screwed into a Zermatt Origin action and load/shoot 300gr Sierra's with an average velocity of 1,050 fps. I have had Zero issues stabilizing this load. (.338 TBAC Ultra suppressor installed).

 

[ELR LVR]

I have a cut rifled McGowen 16" x 1.2" straight 6.5 twist barrel screwed into a Zermatt Origin action and load/shoot 300gr Sierra's with an average velocity of 1,050 fps. I have had Zero issues stabilizing this load. (.338 TBAC Ultra suppressor installed).

According to Berger

This is the kind of info I like but causes me to just "Not get" whats up with the 1:3 twist?

 

[SKWERLZ]

Got the last piece I need to build an 8.6 blackout.

.338 1:3 twist.


I figured since Festivus is right around the corner, we could argue about the unnecessary twist rate.


View attachment 1503708

I’ve shot 8.6 a bit in a Q fix
Cool cartridge
I have a dead 338 1/8 barrel I’m contemplating doing a 338 ARC with the front half.

 

[Larry Koch]

The 338ARC or 338BR has potential, for VFS. If someone can make it to the top.

 

[LVLAaron]

So is that 6.5 twist?

I didn't think guys your age wore wrist watches! Haha

Yep, 6.5. I've got a nice little watch collection. That's my greasy shop watch lol

 

[Bodhisafa]

Can anyone model what a 22” 8 twist barrel could do with a hammer 128 grain bullet?

 

[LVLAaron]

 

[SKWERLZ]

View attachment 1689340

^^^^^^

 

[Oso]

Mine are all bolt guns. I got a faxon 1:3 that I plan on using for a 338 arc. Best of both worlds? I'll find out.

I was interested in an update on your build. How is the 1:6.5 twist performing? How is it doing expanding subsonic bullets?

The reason I ask is watching videos on 338ARC vs 8.6BO. Based on gel blocks, the lethality of 8.6BO is undeniable with its massive expansion/cavitation as compared to the anemic expansion of 338ARC (1:8). Whatever happened to the 338ARC being chambered in 1:5 twist barrels?

I watched several videos where the 338ARC shooting Hornady SubX are barely expanded and basically going completely through 2 gel blocks in a row. In one video the guy pulled out 300BO shooting the same Hornady SubX bullet and the resulting wound channel was much worse from 300BO… the only real difference beside bullet size and a slightly faster twist rate on 300BO.

Curious minds want to know how much of an improvement a faster twist rate 1:5 to 1:6.5 improves performance of 338ARC.

By extension/proxy - how much of a difference a slower twist rate (1:6.5) decreases the blender effect of your 8.6BO as compared to the 1:3 twist. Thanks!