Hi andiarisaka. Thanks for the reply. I necked up a 6.5x55 for a test....sorta surprised it didn't crack..what a bulge..lol.
Like you said the s-length was about right..just too narrow.

What really gets me is the rounded shoulder this case/chamber has. It looks pretty similar to the 15 deg angle the 8x50r has...just not quite.
If nothing else I'd like to figure out what type of die I could pick up to at least get the shoulder close out of a 284 win. I've thought about a 8x66 mauser FL die and shortening it to the needed length. ( little by little with a surface grinder.) But those dies don't seem to grow on trees either.

The more I look online and in the books the more I think this is some kind of wildcat.

---------- Post added at 10:36 AM ---------- Previous post was at 10:26 AM ----------

Hey andiarisaka.. You just prompted me to learn something. I've always thought the 7.5 swiss was a necked up 6.5x55. guess not! Thanks!
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