New wildcat caliber

M

Meph

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Has anyone necked down a 7.62x39 to 6mm? I know the 6.5 Grendel uses a modified 7.62x39 case, but what about shooting a 6mm from a case that's a bit less modified?

Did this in class, didn't have the real dimensions with me so it might looked warped or not to scale and the sizes aren't put in, but this might give you guys an idea of where I'm going with this. If you have a hard time reading the side notes, I'll be happy to type them up. I'll put in the sizes and everything when I get the chance.



(I know I probably didn't do the size annotation right, still learning technical drawing so be gentle.)
 
Pudelpointer said:
Why?
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Look at the picture. Has plenty of reasons.

If you don't like those, it defaults to "CAUSE I CAN/WANT"

ben hunchak said:
Check out the 6mm PPC.
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Bloody hell. Someone beat me to it ;P. Thanks for pointing it out, though.

Thinking about it again, the 6mm ppc isn't the best round for anything other than bench rest. Shoulder angle is too steep. I think it would be worthwhile to make a cheap 6mm wildcat with a less steep angle to make it reliable in any action, while still being able to push a 70gr or so over 3000ft/s.
 
The answer to "Has anyone necked down/up a ### to YYY?" is always "Yes - a long time ago". Seriously.

"Vanity Wildcatters" do come up with unique cases though. They invent reasons to change a shoulder angle by 5 degrees, shorten a case by 100 thou or some other meaningless change just to be unique. :p
 
Andy said:
The answer to "Has anyone necked down/up a ### to YYY?" is always "Yes - a long time ago". Seriously.

"Vanity Wildcatters" do come up with unique cases though. They invent reasons to change a shoulder angle by 5 degrees, shorten a case by 100 thou or some other meaningless change just to be unique. :p
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Still, isn't it a good idea to take a common caliber with popular everything, and change it a bit for specific purposes? What would you think of a very shot action caliber in 6mm pushing 70gr bullets a bit over 3000ft/s, that would work just as well and be just as nice and everything like the 7.62x39 we're all used to?
 
It was tongue in cheek - in response to the notion that there's a such thing as a "new" wildcat that fills a real need. Wildcatting can produce some great rounds - the 30/06 produced a host of great cartridges as did the 308, 375 H&H and many other rounds. Necking down a 7.62x39 is/was a good idea - it's just not new.
 
Andy said:
It was tongue in cheek - in response to the notion that there's a such thing as a "new" wildcat that fills a real need. Wildcatting can produce some great rounds - the 30/06 produced a host of great cartridges as did the 308, 375 H&H and many other rounds. Necking down a 7.62x39 is/was a good idea - it's just not new.
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I understand and have no hard feelings. I should have specified or had a different thread title that would have explained more clearly how I wanted to make a wildcat but knew that wildcats are already existing.

But for these particular purposes and with this configuration... The ease of implementing a new caliber like this, as it fits into standard bolt faces and action lengths, uses standard brass and bullets...

Do you think it would be worthwhile?
 
I think it's pretty much been done. Do a search for "6mmAR". There's also a 6mmAR Turbo, with a 40 degreee shoulder.

Looks like the 6mmAR pushes a 105 VLD at about 2750 - 2800 fps. The Turbo will drive 'em 2850 - 2900 fps. Not too shabby.
 
The Baron said:
I think it's pretty much been done. Do a search for "6mmAR". There's also a 6mmAR Turbo, with the 40 degreee shoulder idea that was mentioned.
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... Well at least I don't have to make myself a caliber. Thanks for bringing this to my attention XD
 
Gene Beggs down in the States has made the 6mm Beggs and the .220 Beggs on the .220 Russian case, which is the .22 of the 7.62x39. he changed the radius on the shoulder to neck junction to stop brass flow. A problem with the .220 Russian case. If you go on Benchrest Central and search for 6mm Beggs you'll find lots of info. Reamers are available from Dave Manson.

Good Luck
Greg
 
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