.338 ARC just might be a winner!

[FP1201]

I tried out a couple MSR's in .338ARC and I've got to say they've got some serious thump!
Hodgdon Powders list loads for bullets ranging from 165gr up to 300gr.
I loaded some 300gr Burgers at subsonic and some 185gr Hornady CX at approx 1,800fps. both shot touching groups at 25yds, the plan was 100yds but the Black Flies and Deer Files were tearing my ass up, so I packed it in....besides, it was already in the 90's

 

[SomeSoldier]

Sub'd for more results.

 

[Podmonkey]

I am interested in this cartridge for being the 9x39 Grom we have at home although the 338 ARC seems the superior cartridge. A suppressed AR15 SBR in .338 ARC would be a lot of fun.
In terms of full power supersonics what kind of performance does this cartridge have compared to the big thumpers like 450 Bushmaster and 458 SOCOM?
I hope the ARC line takes off, the 6 ARC seems like a worthwhile improvement over 5 56. I want to see less wonky magazines though. Apparently Geissele has some normal pattern looking magazines, a 25 rounder that looks mostly the same as a 30 round 5.56 magazine. I assume 6mm ARC and 338 ARC use the same magazines.

 

[FP1201]

I am interested in this cartridge for being the 9x39 Grom we have at home although the 338 ARC seems the superior cartridge. A suppressed AR15 SBR in .338 ARC would be a lot of fun.
In terms of full power supersonics what kind of performance does this cartridge have compared to the big thumpers like 450 Bushmaster and 458 SOCOM?
I hope the ARC line takes off, the 6 ARC seems like a worthwhile improvement over 5 56. I want to see less wonky magazines though. Apparently Geissele has some normal pattern looking magazines, a 25 rounder that looks mostly the same as a 30 round 5.56 magazine. I assume 6mm ARC and 338 ARC use the same magazines.

Contacting Dura-Mag, they recommended using their .400 Legend magazine (which we did) and while it looks like a conventional 20 rounder, it only holds (4) rounds and uses a concave "sled"...used these in both a Semi-auto and a Bolt action with zero issues.
For Subsonic I didn't tinker with the Loads, just used AA1680 at 1,050fps Hodgdon only listed one charge.
Hypersonic gave a starting charge of 21.6gr to 24.0 but to achieve the 2.200" COL, 22.0 was all I felt comfortable seating a bullet over without compression...now IF I let them go long (the 300gr Bullets are 2.600) one could out the full 24gr charge in them.
Wholesale, Hornady Brass is .75 cents a case with them being the only producers at this time.
As far as comparison to the .450BM, .458socom, or even the 12.7x42 I would expect the best accuracy from the .338 and depending on Bullet used, as much power factor as the aforementioned...I have all those calibers, and if I were going on something like a "Hog Hunt" it's likely that's what I'd use for bouncing around in the Brush, but if I've got shots with distance, the .358 Winchester thumps the dog-shit outta what ever ya hit.
I've got the 6.5 Grendel's as well and it's a swell cartridge, but there's no plans for 6mm or .224 caliber....there's enough funky calibers already in the Safe, don't need any more, but I can't stand having stripped receivers around.....shit's worse than crack.

 

[dsdmmat]

, but I can't stand having stripped receivers around.....shit's worse than crack.

I hear you, Imagine having enough 80% receivers to build a gun a year for the next 40 years. The temptation to build a gun every weekend is strong.

 

[FP1201]

I hear you, Imagine having enough 80% receivers to build a gun a year for the next 40 years. The temptation to build a gun every weekend is strong.

Lego's for Grown Ups...I swore "no more" and now find myself looking at .400 Legend, I mean after all, I should run a comparison to the 10mm.
Being able to shoot a different gun everyday for a year and never the same twice is a reasonable goal isn't it?