I used to have a varmint in 17 Remington and 204 Ruger. I wish I had written the info down because there was a difference. The 17 Remington had a heavier contour barrel.
You probably had one of the early 204's with the longer barrel.
FWIW.....PacNor has CZ contours in their CNC memory so you don't have to pay for a custom contour.....least they did about ten years ago.