So...upside-down primers and my de-capping pins.

[cigarbufff]

its happened to me. I just deprimed as usual and no problems here

 

[Suputin]

If it was me, I would put a drop of oil in the primer and after a few minutes run it through the decapper GENTLY. Get rid of any residual oil before reloading. Come to think of it you could use water instead of oil and then allow a decent amount of drying time before reloading.

I don't know where this concept of inactivating primers originated but it is 100% BS. I accidentally ran a primer case through the clothes washer and that primer still ignited. Assuming that you can easily inactivate a primer is a recipe for disaster.

To the OP: primers can only ignite from a hard blow. They do not ignite from a gentle push. Otherwise they would ignite when seated in the case. A primer is not fully assembled until it is seated. That process pushes the anvil in contact with the priming compound.

 

[fingers284]

I don't know where this concept of inactivating primers originated but it is 100% BS. I accidentally ran a primer case through the clothes washer and that primer still ignited. Assuming that you can easily inactivate a primer is a recipe for disaster.

To the OP: primers can only ignite from a hard blow. They do not ignite from a gentle push. Otherwise they would ignite when seated in the case. A primer is not fully assembled until it is seated. That process pushes the anvil in contact with the priming compound.

Not true If the anvil is "shifted' sideways or cocked crooked it can ignite the priming compound. kind of like striking a match on a match box effect. I've had it happen twice in a Dillon 650 when the feed wheel advances a primer and the anvil catches on the housing.
I've also had it happen when a primer is scrunched in a sideways feed attempt as sometimes happens in a Lee Loadmaster. No sharp blow required just a regular feed pressure.

You are right on the water thing. I've soaked shotgun primers for 3 days in a cup of water and they all fired on the first try.