Had my mec 9000 worked on at Grand got it home had all kind of problem . Got all worked out but one. After reloading same hull, wads, powder charge, shot as before some crimp reopen after setting over night.Any help would be appreciated
MEC Shooting Sports - 9000 Series (Model G)
Check out the above link for parts and the name of the parts.
I would lower the " #78 cam crimp punch " one full turn and then see what it looks like. If the crimp still needs to be deeper go another 1/2 turn.
The cam crimp punch goes through the " #75 cam crimp die assembly".
To lower the " #78 cam crimp punch" you will need to loosen the " #58 lock nut" that is on the " #78 cam crimp punch" just below the " #33 Turret assembly. Take a flat blade screw driver and stick it in the end of the " #78 cam crimp punch" and turn it one full turn to the right or clock wise, that will lower the punch giving you a deeper crimp.
Make sure you hold the screw driver in the camp crimp punch while you tighten the lock nut with a wrench. If you don't hold the cam crimp punch in place with the screw driver it may turn while you are tighening the lock nut.