Quick answer is I dunno
Id be wary shooting it off, not only because the primers might not work, but also there is the chance that if the primer did go off, some of the powder might ignite, but not all, and then you could end up with your barrels blocked by wad and shot. Or there may be a chance that you might get a delayed ignition of some of the powder halfway down the barrel.
If enough powder did ignite to push the wad and shot, and some unburnt powder half way down the barrel, would it be possible that the rest goes off and you end up with two ignitions, and blow up your shotty or split the barrel ??
Unless they are special and worth about twice the price of a new gun, I think Id be chucking them.
If that sound a bit confusing, Ive only just crawled out of the cot after chasing rabbits all night and havent had enough coffee yet.
![Embarassed :oops:](./images/smilies/icon_redface.gif)