AR10 300PRC

Its not 300 PRC by any means, but I have heard of both 6.5PRC, 338RCM, and 300WSM being done in an AR-10.

Each come with challenges. 6.5PRC can be too long, 338RCM is not really around anymore. All of these cartridge may require opening the ejection port up to handle the bigger cartridge. Tuning will be fun with any of these.

KAK makes a 300 WSM upper.
 
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Its not 300 PRC by any means, but I have heard of both 6.5PRC, 338RCM, and 300WSM being done in an AR-10.

Each come with challenges. 6.5PRC can be too long, 338RCM is not really around anymore. All of these cartridge may require opening the ejection port up to handle the bigger cartridge. Tuning will be fun with any of these.

KAK makes a 300 WSM upper.
Alex Pro makes a 300 PRC