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  #21  
Old 06-03-2019, 03:05 PM
Daryl Daryl is offline
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Originally Posted by Oso Polaris View Post
Can anyone recall a wildcat round that came out 10 or so years ago. Size/capacity it sat between a 223 and 308, with case capacity of 35gr-37g. It was a bottleneck case, not a short magnum or benchrest cartridge. I can't recall much, I believe Starline did a limited production run or two of brass. The shortage of brass was the nail in the coffin as everyone was waiting for more cases to reload.

Are you thinking of the 6.5mm Grendel?

Then there is this one on the right. This is made with a .30/06 reamer, run in 1.5" for a 1.6" length of case as it is headspaced on the shoulder. .303 brass for a magnum bolt face, or .35 Remington brass
for a standard bolt face with Mauser Extractor as both have a .457" head diameter, same as the '06 at 1.5" from the case mouth. I shortened a .30/06 FL sizer die 1" then, then Very lightly lube .303 or
.35 Remington brass & run them into the die to bottom the shell holder against it. Trim to the proper length for a .30/06 neck - .441", isn't it?
Ballistics are identical to the .30BR in both cases, ie: 2,900fps with 130gr. Hornady SP's. 3,000fps with 110's and 2,425fps with 165 Sierra hunting HP's.
I thought it was my idea, but later found out an Aussie did the same thing about the same time. I called mine the .30/03. His was the .30 Pygmy. The round on the left is a standard .30BR.
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Last edited by Daryl; 06-03-2019 at 03:16 PM.
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  #22  
Old 06-03-2019, 03:18 PM
Bill K Bill K is online now
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Quote:
Originally Posted by Daryl View Post
Are you thinking of the 6.5mm Grendel?

Then there is this one on the right. This is made with a .30/06 reamer, run in 1.5" for a 1.6" length of case as it is headspaced on the shoulder. .303 brass for a magnum bolt face, or .35 Remington brass
for a standard bolt face with Mauser Extractor as both have a .457" head diameter, same as the '06 at 1.5" from the case mouth. I shortened a .30/06 FL sizer die 1" then, then Very lightly lube .303 or
.35 Remington brass & run them into the die to bottom the shell holder against it. Trim to the proper length for a .30/06 neck - .441", isn't it?
Ballistics are identical to the .30BR in both cases, ie: 2,900fps with 130gr. Hornady SP's. 3,000fps with 110's and 2,425fps with 165 Sierra hunting HP's.
I thought it was my idea, but later found out an Aussie did the same thing about the same time. I called mine the .30/03. His was the .30 Pygmy. The round on the left is a standard .30BR.
The one on the right looks a lot like the old 30 Herrett. It and the 357 Herrett are fine rounds also. Bill K
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  #23  
Old 06-03-2019, 06:13 PM
Oso Polaris Oso Polaris is offline
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Guys - sorry for the goose chase. The cartridge was not a Grendel or 6.8SPC or any of the other popular short-action calibers that are in production. Its profile was similar to a 260 Rem (shorter neck than 6.5CM or 6.5x47). The case body diameter was larger than a 223 Rem, but not .308 parent case. It was not a rimmed case...not a Herrett. Some of the appeal was a case with a little more power than a 223AI but not quite stepping up into a .308/6.5 CM size cartridge.

Unfortunately, I can not remember the caliber, but it was somewhere in the .224 - .308 cal. I came across it when I was doing some research on for a 6x45mm build. As I recall the developer of the round had a website that offered dies and even chambered AR barrels. There was one vendor who was source of brass that I believe Starline had done special production run. Any thread related to the cartridge was shooters speculating on when more brass would become available...waiting to spot a unicorn.

Sorry - Its like an itch... just out of reach. I can almost just recall it.

Last edited by Oso Polaris; 06-03-2019 at 06:32 PM.
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  #24  
Old 06-03-2019, 07:08 PM
Gary in Illinois Gary in Illinois is offline
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Something here?:

http://www.6mmar.com/6mm_AR_Loading_Info.html
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  #25  
Old 06-03-2019, 09:21 PM
Oso Polaris Oso Polaris is offline
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Default 6mm hagar

I figured it out

6mm Hagar

Based on 30 Remington Case with a case length longer than a 6.8SPC, which made it a tight fit in an AR15 (magazine length issue). The 220 Thunderbolt as a 6mm Hagar necked down to .224.

www.6mmar.com/6mm_HAGAR.php

http://bulletin.accurateshooter.com/tag/6mm-hagar/

Last edited by Oso Polaris; 06-03-2019 at 09:25 PM.
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  #26  
Old 06-03-2019, 09:32 PM
Oso Polaris Oso Polaris is offline
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Quote:
Originally Posted by squirrel_slayer View Post
what caliber? I can think of a few but none that have failed. 6.5 grendel(based of 7.62x39), 6.8 spc(based of the 30 remington), maybe the 30 RAR?(that one did kinda fail but a touch higher in capacity and a shortend 284 case essentially)
There are many wildcat's based off those cases and a few rebated variants of the 6.8spc (20, 22, and soon to be 24 Nosler)
Squirrel Slayer...thanks for helping out...you are the reason that I started chasing this rabbit when I saw your earlier post with your Mamba and the 22 Nosler case.

The 22 Nosler case design screams future failure with the rebated rim, which got me thinking about the Hagar case for your project. Now that I have tracked it down, I realize that it is very close to 6.8SPC so might not be worth the effort then again... "Mamba-Hagar" has a nice ring!
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  #27  
Old 06-04-2019, 04:46 PM
squirrel_slayer squirrel_slayer is offline
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Quote:
Originally Posted by Oso Polaris View Post
Squirrel Slayer...thanks for helping out...you are the reason that I started chasing this rabbit when I saw your earlier post with your Mamba and the 22 Nosler case.

The 22 Nosler case design screams future failure with the rebated rim, which got me thinking about the Hagar case for your project. Now that I have tracked it down, I realize that it is very close to 6.8SPC so might not be worth the effort then again... "Mamba-Hagar" has a nice ring!
Yeah it would be an easy swap to a 6.8 spc variant case/bolt to up the durability. however my main focus is subsonic suppressed with that big heavy bullet so pressures aren't of great concern. However with 6.8 pressures it still shows some pretty impressive energy levels with 180-200gr class of bullets in quickload.

The hagar is another series of wildcats, there was also an outfit that did a .400: straight walled case based of the 6.5 caracano case.

Having a double stacked cartridge was also high on my want list.

MDWS (mad dog weapon systems) has a slurry of AR based wildcats based off a few different cases.
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  #28  
Old 06-05-2019, 09:52 PM
GLWenzl GLWenzl is offline
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So what would you do??? 1963ish H&R factory chambered 22 Jet that is supposed to have a .222 bore came with a nice pile of brass and .222 bullets.

Save the .222s and work up the .224s? Or start looking for more .222s?
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  #29  
Old 06-05-2019, 10:41 PM
ray h ray h is offline
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Gary did you slug the barrel? I wouldn't think they spent money to have a barrel maker make up .222 barrels. They were, for the most part, a cheap gun.
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  #30  
Old 06-05-2019, 11:47 PM
squirrel_slayer squirrel_slayer is offline
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Originally Posted by GLWenzl View Post
So what would you do??? 1963ish H&R factory chambered 22 Jet that is supposed to have a .222 bore came with a nice pile of brass and .222 bullets.

Save the .222s and work up the .224s? Or start looking for more .222s?
I'd venture to guess it's .223 bore. as long as you have enough neck space you should be fine for .224 bullets
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