First, it looks really nice on your bench, and that isn't nothing. Second, I think the lockup makes for more consistent resizing than you get on other turrets, but I don't have any proof of that. Have you looked at the new Creedmoor Sports toolheads for the T7. That might get you 99% of the way there.I was just wondering what the 419 press did that the T7 didn't. I check my runout and see no issues. I seen the 419 press id like to get it and compare but 1300 bills i can buy 4 T7's for that.
FWIW, I only size and load Lapua class rounds on my 419. For mandrel, powder and seat, I use my 550.
For 223, 300 BO or any pistol rounds, I use a large progressive, a 1050 or a Mark 7, because I am very lazy and get bored easily. That is my main goal, to do this stuff without boring myself to death.