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April 3, 2013, 10:22 PM
Doesn't look like it, no.
April 3, 2013, 11:58 PM
I was curious about this, too, and I found an answer on another forum which indicated that Dillon tried to make a shellplate for the Square Deal for .45 AR and there just wasn't enough material left to hold the case, because of the extremely thick rim on the .45 AR.
However, the 550 or 650 are supposed to handle it OK.