In reply to:

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Shouldn't that be 450 3 1/4" brass?

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Correction
You are absolutely correct, Allen! The 475 #2 is made on the 500 case,with a thick rim, while the streight case 475 is, indeed made on the 450 base case! That makes it even easier, the 475#2 brass is not only expensive, but hard to come by as well!