Your 12-3 precedes when staking began and exhibits the problem that led S&W to begin staking. They now stake all guns, alloy and steel.
If it were me, I'd buy the staking tool and stake my gun.
Also, does your cylinder have fore and aft movement? You may have excessive headspace. Primers protruding after each shot is normal, but excess headspace prevents the normal primer reseating against the recoil shield after firing like they're supposed to do.
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Jim
S&WCA #819
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