DF
Depending on the brass, you'll probably have plenty of room for tHe 45 TSX in the CZ, which probably has a slightly longer magazine than my Brno.
In Winchester brass, 14.5 grains of 300 MP barely came above the shoulder into the neck. I didn't use a drop-tube, just tapped the case a little while filling it with powder. Had no difficulty seating 40-grain Tipped Varmageddons, which are only about .01 longer than the TSX's.