I would personally be more worried about the hammer spring(s)being constantly under tension... but dry-firing metal on metal should be discouraged anyway, I feel.
Winchesters (Eg 1200s)can be 'snapped'with a pressed piece of wood or rubber (with the barrel off) actually pressed on the bolt head/pin and then re-assembled.. as you clean it.
I Feel an inexpensive snap-cap of non-corrosive material(plastic with kevlar incert?) may be best for your shottie.
But, why not join a club and actually shoot it !
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***Big Bunny***
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