30 American vs 30 ARX Vs 30 Major

[Sniper338]

Im trying to find info.

30 american is a 6.8 necked up to 30 cal

30 ARX is a 6.5 grendel necked up to 30 cal

30 major - is this the same thing as the ARX? Or is there different specs?

How much more powder capacity would a 6.8 spc necked up to 30 have over a 6.5 grendel necked up to 30?

What would the fps difference be?

Thinking and tinkering here...

 

[mikelucas]

30 American is a 30-30 case with a small primer pocket. The only factory to make was Federal back around 1982-+

 

[gunsandgunsmithing]

The 30 Major came well before the arx but the two are the same, minus neck and free bore differences.
It's basically a ppc necked up and on steroids. Lapua Grendel brass is outstanding.

It boils down to what you want to do and what you want to build on. If building an ar15, brass durability is less critical than in a bolt action BR rifle. I still prefer to build around quality brass availability and the Lapua is top shelf.

 

[thekriebles]

30 American is a 30-30 case with a small primer pocket. The only factory to make was Federal back around 1982-+

You are correct. However, I believe the OP meant to state the "American 30" which does use the 6.8 Rem. SPC as its parent. Black Hole Weaponry offers the chambering.

Here's a comparison showing the 30 Major, American 30 and the 30 Aardvark using the 30 American parent rimmed case. I don't have an answer for you on case capacities. The 30 Major is shorter but fatter. And, the American 30 is slightly longer but more slender. As post #3 states, the American 30 was initially designed for use in AR platforms with a 223 Rem.-loaded length.

 

[Ggmac]

Im trying to find info.

30 american is a 6.8 necked up to 30 cal

30 ARX is a 6.5 grendel necked up to 30 cal

30 major - is this the same thing as the ARX? Or is there different specs?

How much more powder capacity would a 6.8 spc necked up to 30 have over a 6.5 grendel necked up to 30?

What would the fps difference be?

Thinking and tinkering here...

You could compare case capacities in the Lee book . Use 30/30 data as an aprx for the 6.8 case . The 6.8 was a by product of the 30 Rem case which was almost a rimless 30/30 .
Velocity will be very close as case cap is . Vel is also very dependent on so many variables . I shot a lot of and still do of the 30 Ardvark , a 30/30 ack with rim trimmed to .470 .
Not really playing with the ar platform .

 

[Rdlningcltchdmpr]

30 remington AR is a really good alternative. Slightly more powder capacity. Easy to use as it is not a wildcat.

 

[ebb]

Yes Ggmac and I discussed the 30 Remington AR and agree that it would make a good case to build a rifle on. But Remington hasn't made any in several years and says they aren't going too. I don't know why the 30BR isn't in this conversation. About a year and a half ago I got a friend to let me use a die that he had to make some 30 BR cases from Lake city 308 brass. I so wanted to post a picture of a few pieces with the 1 1/4 long neck and ask Guffey what went wrong and did I really bump the neck??? When my 6PPC barrel is toast it will become a 30PPC of some sort. Most likely on 6.5 Grendel brass. Have you seen any 30 REM ar brass in the last few years.

 

[Sniper338]

Yes Ggmac and I discussed the 30 Remington AR and agree that it would make a good case to build a rifle on. But Remington hasn't made any in several years and says they aren't going too. I don't know why the 30BR isn't in this conversation. About a year and a half ago I got a friend to let me use a die that he had to make some 30 BR cases from Lake city 308 brass. I so wanted to post a picture of a few pieces with the 1 1/4 long neck and ask Guffey what went wrong and did I really bump the neck??? When my 6PPC barrel is toast it will become a 30PPC of some sort. Most likely on 6.5 Grendel brass. Have you seen any 30 REM ar brass in the last few years.

30BR aint in the conversation because the conversation is directed at AR15s.

 

[GSPV]

The 30 Major is a fine cartridge in the AR. I’ve been shooting one for years. Easy as it gets.

With that said, if you don’t have some reason to go 30 cal, I’d considered necking it down to 6mm.

 

[GSPV]

PS: The 30 Major is nice in an AR. But, dude, it comes *alive* in a bolt gun.

 

[ebb]

Ive shoot a 6BR in an AR15 why is a 30 BR undoable?

 

[ebb]

The 30 AR that Daniel mentioned has a .500 base dia as does a 450 bushmaster. why is a 30BR off the table?

 

[mturner]

The 30 BR is perfectly doable in the AR. For shorter OAL loads with lighter bullets, maybe a 30X44 for true 30-30 capacity.

 

[B Mize]

What about the 30 AR Herrett?
6.8 case shoulder pushed back and trimmed off.
You shove a 6.8 case in a herrett die and trim it off.
Hornady still makes dies so they are cheap too.

AR Performance is where I got my barrel from.
From memory it was a 110gr at 2800fps maxed out and a 130 gr at 2500fps.
I sold mine last year sometime.

 

[Dusty Stevens]

Go with the good brass. Never build a rifle around shitty or limited availability brass. 6.8spc was a severe failure so just like building an rsaum or wssm sooner or later you wont have brass and if you do itll be shitty brass

 

[Tim Singleton]

7.62x40wt for an AR is a good one as well

 

[Sniper338]

Go with the good brass. Never build a rifle around shitty or limited availability brass. 6.8spc was a severe failure so just like building an rsaum or wssm sooner or later you wont have brass and if you do itll be shitty brass

I agree, but dont say that about the rsaum!! I have fingers crossed someone will make it so I can build a 300 rsaum improved

 

[Dusty Stevens]

I agree, but dont say that about the rsaum!! I have fingers crossed someone will make it so I can build a 300 rsaum improved

Dont hold your breath. Lots of cartridges come and go.... mostly they go.

 

[Louisiana Shooter]

Really need to listen to Dusty on the brass issues.........don't say you weren't warned.

Unless you buy enough brass to toast the barrel BEFORE you get the barrel made, you could get stuck with a very expensive club.

 

[jimmymac]

Zombie thread.