I would also think they are factory. Here in Pennsylvania I was given some identical cartridges that came in a old, disintegrating Remington box. The box was literally moldy, so I tossed it. Still have the ammo around here somewhere.

I also remember my Dad had a coffee can full of .38 ammo with that style bullet that he had gotten from a friend who was with the Philly PD in the late 1960's. It worked real good in my Highway Patrolman in 1989.

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Wheel guns are real guns.