I have not shot factory ammo through it, but I have a M67 whose double action trigger pull I estimate to be under 7 pounds and it will not reliably ignite Winchester or Wolf primers. This revolver's hammer spur has been removed so I have no idea what the single action trigger pull might be were I able to fire it single action.

I assume that most factory ammo wouldn't work in it either but since it is a "competition gun" and well-seated Federal primers work (which is what I use in it) the fact that factory ammo won't work doesn't matter to me.