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Hawg +1.
But, if you really need to remove them, here's what I do on the really tough ones.
Assuming that the nipples have been soaked in a good rust removal medium (Kroil, Liquid Wrench, a 50/50 solution of Automatic Transmission Fluid - ATF - and acetone, etc.)...
First, make a nipple wrench out of a deep well 1/4" drive socket by cutting slots for the shoulders on the nipple. Insert two wooden dowels into chambers on opposites sides of the cylinder, and tighten the free ends of the dowels in the jaws of a small vise - the cylinder is now held from rotating by the dowels in the chambers and the jaws of the vise.
Set the vise on the table of a drill press (unplug the drill first). Tightly chuck the nipple wrench you made from the socket into the drill jaws. Lower the drill head down and rotate it to put the nipple into the slots on the wrench. Lock the head into the down position. Now turn the head by hand to loosen the nipple.
The hard steel of the socket will prevent wrench failure and the drill press head ensures that the only load applied to the nipple is pure torsion.
Following cleaning the gun, use Ballistol or Birchwood Casey's Barricade for long term rust prevention. Both products are compatible with black powder combustion.
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