Never tired using Federal in a LEE progressive, but I use them in Auto Prime all the time. It's easy to tell when something isn't seating correctly by feel, so I doubt it's a worry. I also point the tool away from my face.
I use Federals in my RCBS progressive (in the tubes) and don't see the difference between that and using a primer tube in a Rockchucker, as in both cases the primer getting seated is separated from the tube full of primers.
Looks like the LEE primer tray in thier progressives has all the primers sitting on top of the one getting pressed into the primer pocket, which likely makes "detonation" of many primers more a risk.
I use Federals in my RCBS progressive (in the tubes) and don't see the difference between that and using a primer tube in a Rockchucker, as in both cases the primer getting seated is separated from the tube full of primers.
Looks like the LEE primer tray in thier progressives has all the primers sitting on top of the one getting pressed into the primer pocket, which likely makes "detonation" of many primers more a risk.