[dipper]

I don't think it is much of a concern.
If I understand correctly, you heated the head of the action screw up with your propane torch while the barreled action was still in the stock...it wouldn't break free so you drilled the head of the screw out to remove the barreled action.
I think it would be virtually impossible to do any damage to your action using a propane torch to heat the head of an action screw.....don't think you could even approach the temperatures needed to affect the action even if you held the torch on the screw for sometime.
The bottom metal, stock and barreled action itself would act like a big heat sink and you would have to hold a propane torch on it for I don't know how long to even approach a temperature that would affect the heat treatment of the action.
Next time, wax the action screws and apply a coat of grease to the screws and floor plate and the bedding material won't stick the parts together.