machine gun brass. ring crimp. needs a single stage press with standard dies to do it right. will damage your turret press if you do lots of it. throw it away or buy a cheap C-press or O-press at the next yard sale/gunshow you go to and use RCBS/Redding etc dies that can handle the stress of first go round. then be sure to ream primer pockets after first de-capping.
your lee turret press dies use a decapper/expander that is friction fit to collapse if excess pressure. this to protect your aluminum turret fitting from being damaged. you can tighten the fricton fit with a wrench. loosen nut on top, slide rod down flush with top of nut, and tighten nut with wrench.
i decap the occasional crimped in 9mm range brass with same press you have, but thats a different animal and circumstance.
this is why i do not recommend a progressive or turret as first press for anyone. should start with a RS2 or a rockchucker. i have 5 presses on the bench, including 1 just like yours, but use it for hi production handgun ammo only.