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Gunco Irregular
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2,990 Posts
Discussion Starter · #1 ·
I was interested in the 6mm-06, an old wildcat from the '30s. I wondered if I could just neck size .30-06 cases with a common .243 die set.

I brought up the SAAMI drawings for the .243 and .30-06, and then for the .308. Hmm, interesting.

The .308 is commonly described as a shortened .30-06, looks to be true... but it's it's also less tapered, probably because the length to the shoulder is shorter. The .308 has a 20 degree shoulder angle vs. 17d30' for the '06.

The .243 is literally a .308 necked down to .243. It uses the same shoulder angle, so the base of the neck is further out... and since the neck length is about the same, a .243 case is .030" longer than a .308 case, which is about what you'd get if you ran a .308 case into a .243 die.


Redding makes 6mm-06 dies for $300, RCBS for $150, or CH4D for only $87. For some reason the CH4Ds weren't showing up on Google searches, but they're on the "caliber list" at their web site.
 

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3/6 Infantry
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4,766 Posts
Like when I went looking for a 6.5 x 257 Roberts die set. Pricey! I ended up neck sizing with a 6.5 swede die I had laying around. Good luck on your quest, Sir!
 

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in the blueridge mtns
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8,264 Posts
I had forgotten the 257 came from the mauser cartridge. What was the 221 case based on? The Savage lever gun set a standard for its time.
 

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Gunco Irregular
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2,990 Posts
Discussion Starter · #5 ·
Most of the .470" diameter rim cartridges are descendants of the 8x57 Mauser. That includes all the x57 Mauser cartridges, the .30-06, .243, .35 Whelen, and all their variants. They're generally grouped as "large head" cases.

The .221, .222, .223, and their ilk are the "small head" cases. I don't remember what the original cartridge was.

Then you have a bunch of oddballs, of course. The 6mm Lee Navy begat the .220 Swift, which has an odd head size. The .25. .30, and .32 Remingtons went obsolete, then came back in a shortened version as the 6.8 SPC. Then there were uniques like the .30 Carbine or .22 Hornet. Of course the gun cranks have wildcatted everything...
 

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in the blueridge mtns
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8,264 Posts
As I recall the 221fireball was a proprietary cartridge by Remington for that odd at the time XP100. And Stoner or Sullivan just blew the 222 out to achieve the required velocity of the AR15 giving us the 223.
 
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