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It appears as though the #5 Rook uses a .360 cartridge, generally not an off the shelf round, though I suppose
if you wanted to see if the gun fired you could contact an ammo maker to make a .360 round - issue being it would probably need to be cast from a real one, presumably very old. Here is something you could contact to see - Penn ammo http://www.pennbullets.com/38/38-caliber.html
I believe makes a 38 long, so I would assume they could make a 360.
Good news though you can find them, you just really need to keep searching. If you click this link http://www.ows-ammo.com/store/index.php?main_page=product_info&cPath=62_68&products_id=637
you will see a 50 round box for sale.
I will keep going on the pistols to see, let me know what you think about this 360 round box.
Is where you should be able to find the rounds for the wildey pistol. Depending on the caliber you have(I am going to assume a Wildey .41 or .475) Hawk should be able to fit your needs for the cartridges so you can use your Wildey. Just let know what else you need if anything.
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