Assuming the gun is otherwise in good shape, my solution would be to rig it to free-spin once the loading gate is open, assuming this is a Ruger "New Model" action (made from 1973 forward).
You can alter the pawl or buy a pawl already altered, although you'd probably have to fit that pawl to your gun. Easier to modify the pawl you have:
http://www.ktgunsmith.com/freespinpawl.htm
http://marauder.homestead.com/files/FreeSpin.html
With the loading gate open the cylinder will now "free spin" to wherever you want, allowing proper ejection.