I had a FTF with a win primer, 9mm/W231.
Tried twice. Nice dimple, no bang.
Tried two different guns even.
I've yet to dissassemble to determine a cause, if possible.
it's seated deeply enough so I'm assuming a defective primer or it got wet/contaminated. I had a couple do that when I was in a hurry to reload a batch of brass. I spray lube my cases as it makes them much easier to resize. I've since learned to be 110% sure they're dry as it doesn't take much wet lube to make a dud round. (lee lube cut with water and alcohol)
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