Quickload 8.6 Blackout help

[liltank]

Hey fellars and ladies!! Been a hot minute since I've posted for help. Looking for someone to help me run Quickload work up. Looking for Supersonic load data.

Bullet: .338”
Hornady 300 A-Tip- 1.8665" OAL- 2.8320"
Hornady 230 ELD-X- 1.5270" OAL- 2.7150"

H2O- 45.7gr

Case Length- 1.6800"

Powders interested in using
Tac, StaBall Match, Accurate 2520, Shooters World Tactical Rifle
Max PSI- 52,000

Barrel: 3 groove 1:6 16"

Thank you for your help. Let me know if you need any other data.

Tank

 

[ELR LVR]

Just curious,
One guy had me chamber an 8.6 Blackout for him
and supposedly these need a 1:3 twist barrel
Are you really able to use a 1:6 with those A-Tips?
Have you tested this yet?
Thanks, I have no experience in this cartridge other than chambering one
Once
That was the first I heard of it
(I rented the reamer BTW)

 

[liltank]

Just curious,
One guy had me chamber an 8.6 Blackout for him
and supposedly these need a 1:3 twist barrel
Are you really able to use a 1:6 with those A-Tips?
Have you tested this yet?
Thanks, I have no experience in this cartridge other than chambering one
Once
That was the first I heard of it
(I rented the reamer BTW)

Talking with Hornady, they stated that 1:7 will stabilize all of the heavy bullets in .338. If you look at the 338 ARC, it’s designed around a 1:8 twist. Using AB ballistic app. My stability factor at an estimated 1040fps shows a factor of 3.01 with a 1:6 twist barrel. It’s recommended to have a stability factor of 1.5 or better.

 

[ELR LVR]

Ok, thanks
Good info
I just dont get why most are stating it requires a 1:3
I figured due to how slow they are going
but even at 1040fps, it still doesnt make sense to me why most are 1:3

 

[ELR LVR]

Ok never mind
I just found this
Supposedly More Kinetic Energy on target with a 1:3
(whatever right?)

 

[liltank]

Ok never mind
I just found this
Supposedly More Kinetic Energy on target with a 1:3
(whatever right?)

The rotational force of the bullet definitely makes a difference from what I’ve seen. However, it is impractical if you want to shoot standard cup and core bullets. That is why I’m going 1:6. Allows safer bullet flight at supersonic speeds.

 

[ELR LVR]

I have witnessed the more RPM a bullet has ....makes for easier penetration
acting like a drill.
I noticed this on steel
Did not consider it was needed for bone though, with heavy 225 gr and above bullets

 

[Jager]

Here's a quick snapshot of what you might be looking at for one of your bullets. You might want to double-check some of your numbers. The QL database has the 230gr ELD-X bullet at 1.495", COAL=2.825", case length=1.684", and case capacity=51.0gr. That latter, especially, is substantially different from your 45.7 and would make a big difference.

The 8.6 BLK isn't SAAMI, of course, so there's nothing "official." But QL has a default Max chamber pressure of 47,862, a bit lower than your 52K.

Assume you meant Accurate 2520, not 2025.

In any case, the print below is using your numbers.

With two bullets and four powders you're looking at eight detailed workups. Maybe consider buying QL? Or GRT (free).

 

[liltank]

Here's a quick snapshot of what you might be looking at for one of your bullets. You might want to double-check some of your numbers. The QL database has the 230gr ELD-X bullet at 1.495", COAL=2.825", case length=1.684", and case capacity=51.0gr. That latter, especially, is substantially different from your 45.7 and would make a big difference.

The 8.6 BLK isn't SAAMI, of course, so there's nothing "official." But QL has a default Max chamber pressure of 47,862, a bit lower than your 52K.

Assume you meant Accurate 2520, not 2025.

In any case, the print below is using your numbers.

With two bullets and four powders you're looking at eight detailed workups. Maybe consider buying QL? Or GRT (free).


View attachment 1635801
View attachment 1635802

Much appreciated. My OAL was determined by pushing a seated bullet in the case into the barrel chamber. I kept adjusting the seating depth until it did stick in the throat. Then backed off by .010” for OAL. I don’t have an action yet. Not sure the free bore in the barrel will allow for 2.825”.