I looked at building a 7WSm recently & was turned off for the very same reason. Couldn't find brass & told on backorder with no expected delivery date. A quick google search revealed a similar problem in the USA. It appears that you would likely have to neck down 300WSM brass then fireform - the kicker is the shoulder junction is in a different spot so a Hard projectile jam would be required. Goodluck with your search.
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