i actually fed-it back into another mag and it went bang,
A very strong argument for TDA or true DAO guns in the defensive role. Second strike capability isn't needed often, but could be very important........
It seems like there's 2 kinds of people. Some have all kinds of dud rounds that always go off on the second trigger pull. Some have never seen this happen. I'm in the latter group.
I've had probably 8-10 misfires with centerfire ammo. Another 3-4 with rimfire.* All but two of these occurred in a hammer-fired gun. None went off on the second strike. Often, they fired if rechambered, so the primer was rotated - after having failed to light on a second/third strike (fully cocked, SA style, even). And some didn't go off even after rechambering. The other two happened in a Glock. After rechambering multiple times, they did not go off. I guess I've never encountered a primer that wasn't fully seated. The fact that he rechambered the round means we don't know if a second strike would have done anything but waste time.
A second strike not only hits the primer in the exact same spot, it is also weaker. The DA sear releases a bit earlier than in SA, in most action types.
I'd rather rack in a new cartridge, even if I felt there was a reasonable chance for a bang... which, based my my own experience, I don't. I see this as a very weak and unreasonable argument for TDA. The only time I'd attempt this is if 1) I were aware my ammo was highly prone to having this specific issue, in which case, I probably wouldn't be using it for SD. Or 2) if I happened to be carrying only 1 bullet in my gun. Because if the second strike does not work, you not only waste time, but you also alert your attacker to the fact that your gun is not functioning. Stupidity is trying the same thing over and over and expecting a different result. Esp considering the chamber could be empty, the primer could be bad, etc.
Have fun learning to do a "aim, click, tap, rack, assess" drill. When that "click" happens to be a bang, it'll just confuse you even more. And hopefully you still aimed it just as carefully as you normally would have. You're responsible for every bullet that leaves the gun, whether or not you thought it would really go off.
*not including Golden Bullets. With those, I've had 50+ misfires (out of a single box). None fired after rechambering, but I stopped trying after the first 6-7.