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This got me thinking. I got this set of dies second hand. Maybe the previous owner did something with the decapping pin... lo and behold, it does not flare out like the replacement one listed on...

Yeah I did. ID of the neck is, on average, .300".

AFAIK, there's nothing I can do about that.

I didn't mind Lee dies, but in this case it was the die.

Got Hornady FL die and the projectiles seat with no issues now.

Three O'Three did you manage to get this sorted with the Hornady Seating Die?

I have Lee dies for 3 different rifles, but the 300 BLK doesn't seat projectiles straight. It's so bad, the neck...