I guess it is possible that the Cartridge case being skewered to one side or the other could make a difference in sizing . I know that if I use my SB sizing Die , the sized case will grow because you are sizing deeper on the case , but when the Shell Holder is contacting the Die Base , that should produce the same results , the Die is the same , same Shell Holder , the only thing thats different is the Press , even so , its the same equation , Shell Holder contacting the Sizer Die Base , dimensions should come out the same .
Saying that the only thing that is changed is the Floating Shell Holder , unless I'm missing something . I can see if I used different Shell Holders or Sizer Dies , but didn't . This makes me wonder have loaded ammo will perform from this Press , can't see a Velocity change ,because the case volume isn't going to change by how the Case is sized , then again , if the Case is being sized & you have to trim it & take brass mass away , that had to come from somewhere & that may indeed change Case Volume .
If the Sized case holds to the over all case length from sized case from this MEC set up , I will not have to trim any cases or trim far less . My tolerances for sizing are 2.0045" to 2.0055" , that is what I load , if less I don't use them for anything but blasting ammo for testing & if more then they get trimmed .
This is going to be fun , testing using this press , I have to copy some of the loads I have already test , jut to see if there is a difference in some way . If anything , Case life should be lengthened if this sizing dimensions hold true .