338 ARC

[Ledzep]

Looking through the different .338 cal cartridge performance classes, 338 ARC seems to be a 338 Marlin Express that fits in an AR-15. It should be a hammer both with supers and subs.

Could get interesting with purpose-built lower expansion threshold monoliths.

The other thing I like is you have high mag capacity with heavy-hitting loads. It will be interesting to see if mags need stronger springs like 300 Whisper does for the significantly-heavier cartridge stack once you start talking about 25-30rd mags.

@45-90 do you have any 25rd ASC Grendel or 30rd Geissele 6mm ARC/Grendel mags?

@Ledzep what capacity magazines did you guys test with the AR-15s? I know in the podcast that there was discussion about how well they fed and cycled, which surprised some of the people who shot them in ARs.

Let me touch base with some folks about that. I have been loosely involved with the bullet (307 sub-x) but haven't done much with weapons systems. I know that MDT 6mm ARC AICS pattern magazines work well with it in a bolt gun, but I'll double check on the AR-15 front. I'd imagine mostly 10-17 rounders, and I think I heard the E-landers' guide rib pokes inside too far but we're talking with them and several other companies at this point to make compatibility as good as possible.

 

[JR1200W3]

The 350 gr Maker may not even be able to be used....have to see if max velocities top out before expansion maybe as low as 600 to 800 fps. Soon we will know....

You better not post anything that didn't kill an animal

 

[45-90]

I was looking at Hornady’s data for the .338 Marlin Express, and they’re showing a 200gr FTX at 2400fps from a 24” barrel out of a lever gun.

Hornady is saying 2075fps from a 16” barrel for the 175gr in 338 ARC.

When I drop the barrel length for that 200gr .338 Marlin down to 16”, it gives me 2232fps.

This is the closest of the legacy .338s I could find to 338 ARC performance, comparing Lever gun pressure to AR-15.

The 338 ARCs closest competitor is the 300 blackout....the 175 gr sectional density is equal to about 143 gr in 30 cal.
So at this point the 300 Blackout is a better supersonic round than 338 ARC.
The 300 Blk about 4 grs less powder capacity 26 gr to 30 gr but 10,000 psi advantage.
As a result my 300 blkout 16" barrel runs 175 gr Nosler RDF at 1922 fps out of a factory barrel. The 338 ARC runs 2075 out of a factory test barrel... but in reality is probably 100 fps less in your auto loader.
Which puts them at the same enery level, but the 30 cal 300 blackout 175 gr has a much higher BC and sectional density than the 338 175 gr Hornady. So it will over take the 338 in energy and penetration with such a light supersonic bullets in the 338 ARC.
Just the facts....So why bother with the 338 ARC?
It's its subsonic potential with 300 gr bullets, for superior accuracy. Cause small capacity and good case fill should be clean powder burns at higher pressures and more consistent velocities than other subs.
For hunters the 300 gr expanding billets offers more energy and larger diameter for the possibility of larger wound channel capability, than the 300 blackout.

 

[45-90]

You better not post anything that didn't kill an animal

I ain't gonna kill any game animal with it, (maybe an unlucky rabbit) ....that will be up to you.
But I'll test it for velocity to even see if it falls within the narrow expansion specifications of the maker.
My personal concern is excellent accuracy with the 300 gr match bullets, and possibly others, when tested. Mostly targets and a few short range rabbits tests.

 

[clcustom1911]

I'm waiting to see what all the hornady haters will say because its always fun to see people spaz out. When I saw the podcast title at first I thought it was going to be some type of short action magnum for AR10's. When I saw it was just a subsonic primary AR15 round with more kinetic energy I was a little disappointed but I look forward to seeing how it does against Pigs.

It'll be the same people who 10-12 years ago clowned on the 6.5 Creedmoor and said it would die after a year or two.

 

[Gtscotty]

That makes things a little more interesting for us poors, I could see myself getting a daily deal upper to play with at some point, especially with some cheap AAC fodder to run.

Palmetto State Armory on Instagram: "338 ARC WHEN?? We’re proud to announce that we’ll be partnering with @hornadymfg to bring you 338 ARC options👀From new developments in the JAKL and Sabre lines to ammo from AAC, this project is going to be big! S

3,670 likes, 291 comments - palmettostatearmoryofficial on October 28, 2024: "338 ARC WHEN?? We’re proud to announce that we’ll be partnering with @hornadymfg to bring you 338 ARC options👀From new developments in the JAKL and Sabre lines to ammo from AAC, this project is going to be big! Stay...

www.instagram.com

 

[rlsmith1]

TELL THE MARKETING PEOPLE WE WANT 6ARC FIRST!!!!!

I'll probably get a 338 ARC if PSA is making ammo for it (after I get 1k of their 6 arc)

 

[JR1200W3]

TELL THE MARKETING PEOPLE WE WANT 6ARC FIRST!!!!!

I'll probably get a 338 ARC if PSA is making ammo for it (after I get 1k of their 6 arc)

..teach a man to fish....

XL750

The Dillon XL750 is a high-speed progressive reloading machine designed to load common rifle and handgun cartridges from .17 Hornet though the common belted magnum cartridges in rifle and .32 ACP through .500 S&W in handgun. The XL750 comes with a lifetime warranty against manufacturing...

www.dillonprecision.com

 

[rlsmith1]

..teach a man to fish....

XL750

The Dillon XL750 is a high-speed progressive reloading machine designed to load common rifle and handgun cartridges from .17 Hornet though the common belted magnum cartridges in rifle and .32 ACP through .500 S&W in handgun. The XL750 comes with a lifetime warranty against manufacturing...

www.dillonprecision.com

Looked into that and then looked at what I would spend on an autodrive and autotricklers and it just got to be more of a hassle than I wanted to deal with. But I hear you, reloading at scale is a superpower!

 

[JR1200W3]

Looked into that and then looked at what I would spend on an autodrive and autotricklers and it just got to be more of a hassle than I wanted to deal with. But I hear you, reloading at scale is a superpower!

I just wanted you to know there was a legal way to be free from factory ammo availability