Our procedure with the 1916 3" AA gun is to wait 30 seconds and try a restrike. The firing pin can be removed without opening the breech. It is re-cocked and re-inserted. If it doesn't fire the second time water is put down the barrel (we use black powder) and a 30 minute count down starts. Only after that time is the breech opened and round removed.
We've only had 1 misfire and it fired on the second strike. After 100 years the firing pin was a little offset and didn't hit the primer properly. Been fixed since.
Hopefully all goes well for Remembrance Sunday when the WW1 gun fires the start of the two minute silence and our WW2 25 pounder marks the end.
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