Substitutes for the 5.56 mm round


#21

[quote=“TonyWilliams”][quote=“cartguy”].500 Phantom
Zac[/quote]
I think that the .500 Phantom is intended for AR-10 length actions rather than AR-15, and some loadings are longer than that - see the Teppo Jutsu lineup below.
[/quote]

Tony,

Marty built a small number of AR-15 .500 Phantom uppers after certain folks like myself pointed out that it should fit in the AR-15 magazine when loaded with shorter 0.510" projectiles like those designed for the .500 Linebaugh and .50-110 Winchester. If I remember correctly, he modified proprietary Olympic Arms uppers used in their WSSM conversions. (WSSM = Winchester Super Short Magnum)


#22

hello
PIVI the 30 american and the 300 american is not the same round
the 30 american look like a 30.30 winchester but with small primer


#23

The 30 American is not really a cartridge but, instead, is a case. It was developed in the last Century by a couple of Benchrest shooters to be used as a parent case for forming rimmed competition wildcats. Sorta like the Remington B.R. brass from the same period used to form rimless wildcats. Sure, guys seated a 30 caliber bullet in the case and called it the 30 American but it was a lot more than that.

BTW, I still have a few boxes of both the 30 American and Remington B.R. to trade if anyone is interested.

Ray


#24

[quote=“DanielWatters”][quote=“TonyWilliams”][quote=“cartguy”].500 Phantom
Zac[/quote]
I think that the .500 Phantom is intended for AR-10 length actions rather than AR-15, and some loadings are longer than that - see the Teppo Jutsu lineup below.
[/quote]

Tony,

Marty built a small number of AR-15 .500 Phantom uppers after certain folks like myself pointed out that it should fit in the AR-15 magazine when loaded with shorter 0.510" projectiles like those designed for the .500 Linebaugh and .50-110 Winchester. If I remember correctly, he modified proprietary Olympic Arms uppers used in their WSSM conversions. (WSSM = Winchester Super Short Magnum)[/quote]

That’s interesting, and I am sure is a story that not too many people knows.


#25

Is it appropriate to say that many of these were developed to “replace” 5.56? Many are designed to complement in one way or another the use of 5.56 as a standard round, either as subsonic, big game, special purpose, or in some other role.

My contributions to the thread:

.30 Remington AR:

.204 Ruger:

6.8mm Taiwanese (no picture, but here’s an article mentioning it).


#26

[quote=“Tau”]
6.8mm Taiwanese (no picture, but here’s an article mentioning it).[/quote]

Fascinating - I’ve never heard of that one. Does anyone have more details?


#27

[quote=“DanielWatters”][quote=“TonyWilliams”][quote=“cartguy”].500 Phantom
Zac[/quote]
I think that the .500 Phantom is intended for AR-10 length actions rather than AR-15, and some loadings are longer than that - see the Teppo Jutsu lineup below.
[/quote]

Tony,

Marty built a small number of AR-15 .500 Phantom uppers after certain folks like myself pointed out that it should fit in the AR-15 magazine when loaded with shorter 0.510" projectiles like those designed for the .500 Linebaugh and .50-110 Winchester. If I remember correctly, he modified proprietary Olympic Arms uppers used in their WSSM conversions. (WSSM = Winchester Super Short Magnum)[/quote]

Thanks - that’s news to me!


#28

I know that several AR 15 were rechambered or made for the 7.62 x39. Several wildcats of this basic case exist too.

Does anyone know if wildcats like the 338 x 39 or the 35 x 39 were developed for use in AR rifles to match ballistics of rounds like the 338 Whisper #2 ( 338 / 7 mm Rem BR) or the russian 9 x 39 mm?


#29

Hi Pivi,

I was under the impression that the .300 American was just the early name of the .30 Remington AR.

Here’s a quick comparison of dimensions (.30 AR v. .300 American)

rim: 12.37mm v. 12.40mm
head: 12.56mm v. 12.60mm
shoulder: 12.29mm v. 12.32mm
case length: 38.66mm v. 38.66mm

Paul


#30

If you scroll down to the bottom of Teppo Jutsu’s .500 Phantom page, there is a picture of one of the AR-15 conversions. Marty states that there were only four AR-15 uppers built.

Here is a link to a 2006 post on AR15.com from the owner of the rifle shown:

http://beta.ar15.com/archive/topic.html?b=3&f=121&t=288174

And here’s a post from Marty himself offering the other three uppers:

http://www.ar15.com/archive/topic.html?b=3&f=121&t=285848