Pay attention while reloading dummy...

[Pinsnscrews]

Bonehead of the day winner.

I "Thought" I had locked my seating die down when I started my last run of reloads. I started the run at 1.26...apparently, the die crept and somewhere along the run of 300 rounds, my seating die slipped to 1.275

Just enough the rounds wouldn't feed into the magazine.

We had some stuff come up, so the loading boxes are all mixed around, and I haven't had a chance to figure out what the first loaded box was.

Oh well, at least the Magazine caught the issue right off the bat rather than one getting loaded and jammed into then leade causing a major pressure spike.

[The_Shadow]

You could just re-adjust the die and continue or did yo final crimp them?
You could try to seat them deeper (to proper depth) without any crimp application looking for any signs of bullet shaving, case buckling or the bullet loosening up as re-seated. 

Don't beat yourself up over it just re-work them...

[Pinsnscrews]

Found out at the range  LOL

I don't want to chance crumpling the cartridge.

They are plated rainer's, so if I damage the bullet, I may just throw them in the smelting pot.