Ouch! Deprimer Pin failure(s)

My cousin had given me an unopened box (48) of DI Z 1944 .303 ammunition which I shot at the range this past year. Shot pretty good. Anywho, yesterday being cold, I thought I would prep this brass to reload in the Man-cave. The brass was well lubed, but depriming seemed a bit more effort than normal. Aboot 15 rounds in, I bent my Deprimer pin. This happened to me many, many inexperienced years ago, and it was because I was trying to deprime Berdans! These are all Boxer. (Since the original incident, I have been using a thin tungsten rod for TIG welding cut to length with no issues.) Has anyone else ran into this issue? Thanks!

I’m still using a handful of DI Z 1943 marked cases that were given to me many years ago. They were factory loaded when I received them and sold under the name of Belmont ammunition. Mine had a very heavy primer crimp in place. I recall having to use a considerable amount of force to deprive them. It also took a bit of work back then to remove the crimp in order to re prime the cases. I have a primer swagging die that makes easy work of removing primer crimps these days but had minimal tools back then. I suspect a heavy primer crimp is the cause of your damaged de priming pin. 

You are not alone I once forced the decapping pin through what turned out to be a Berdan case

This wasn't but I noticed in a picture Goosic posted of some Winchester made military .303 it looked like it was. Mine has kind of a "ring" inside the primer pocket. I deprimed 50 fired PPI today with not a hint of an issue so I think the '44 stuff just had tight primers from age, etc. There was no corrosion or discolourment so I'm not positive.

I got one of these to remove crimps

Yeah I have a bunch of crimped primer ammo. Its all military & non re-loadable though.