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Fill me in, why not use the federal 210's with the Lee Auto prime?
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In my experience, federal primers are softer than winchester. Winchester are softer than CCI. I believe that the Federals are a little more apt to 'prematurely ignite' if handled 'roughly'. I know that guns that won't set off Winchester or CCI due to light primer strikes can be used with Federal primers because they are softer/thinner. My guess is that its a safety issue with the hand primer tools, where your face is so near the primer tray. I believe one of the primer manufacturers recommends a small number of primers be placed in the tray when using a hand primer (to lessen the chance of injury if/when a chain fire occurs). They also recommend safety glasses (a good precaution that could save your sight during the few minutes you use these tools).
I've witnessed a chain fire of more than 100 small pistol magnum primers in a Dillon press. The Dillon contained the explosion, I'd hate to see a chain fire in a plastic hand held device.
BTW, when I'm not using my Dillon progressive, I use a Lee handheld priming tool, I try to only dump a few primers (10-20) at a time. I use Remington and CCI primers mostly for my rifles. I use Winchester primers in all my Cowboy Action competition loads.
I've tried the federals and they are so soft that I end up bending them in my progressive, so I don't use them.
Hope this didn't ramble too much (drove more than 600 miles + worked today and I'm a little tired).
Don