Ahhh! I didn't see your post until now (5:15PM) . I would have gave you one, very slightly used, if I knew you were serious about buying one. I can't stand them.
No, the die may, but the movement will be so subtle you won't notice it.
I can set up my lock out dies, either RCBS or Hornady lock out, to pick up .3gr of variation and lock up the press on .3gr of an overcharge. That is the way I use them. I can't see that with a powder cop die unless I stop everything and measure the o-ring height above the top of the die body with a dial caliper.
You may be able to, but I think you will drive yourself nuts trying to let a Powder Cop die govern whether your powder charges are acceptable.
My lockout dies will also stop the press with a no charge as long as you are within the .3 gr variation of your target charge. If I set it for around +or - .3gr of my target then they will by default pick up a no charge due to the fact that there is no cartridge that only take .3gr of powder for it charge.
I wish I would have known you were ready to buy one. Rats! I run a Hornady LNL-AP and the charged case is front and center to the operator on that press so if the operator is going to look down to look at the powder cop die you may as well just look in the case and save the station on the press for another type of die.
What type of press are you using.