Perhaps part of the appeal is my enjoyment of bullet casting, and the rooks seem like an ideal platform for mild lead loads. I'm thinking perhaps some sort of a 30 caliber, perhaps a 38 special necked down?
Allow me to do the directing this time. Funny thing you should ask about rook rifles, i was scouring Midway for something interesting and found just what you need
here's a link:
http://www.midwayusa.com/online/productpage.exe/showproduct?SaleItemID=502726
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When in doubt, do a nuclear strike.