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Yep. Federal loads 500 grain bullets for it. Epp's is a Federal dealer. They don't list it on their site, but they should be able to get it. IF their supplier has any in stock. Be prepared to dig very deep into your wallet and pay up front though. It runs between $250 and $280 USD per 20($12.50US to $14US a shot) at Midway.
Epps sells it , they may or may not have it in stock, but it does arrive in a timely manner - maybe try Martini and Hagn - yes it is not cheap - depending on solid / soft point the price is $20+ per round.