Originally Posted by phorwath
Send them back and they'll probably both be replaced free of charge. I'd ask them what they believe could be the cause. Maybe they shipped out some overly brittle sizer dies? Either that or your chamber is mega-oversized?
Yeah, there is something wrong with the dies themselves.
I've been loading since '71 and never heard of a cracked die until just in the last couple months, when someone else said they broke a die and then this post. I've reformed a lot of stuff, some severely, even .308s to .22-250s (don't ask) and nearly stood on handle of a Rockchucker and never broke anything.