That's fantastic. But most folks are using their 17HMRs under 150 or 200 yards, not 400-600 yards. There's a big difference in guestimating the distance at 150 yards vs 400 yards.
Serious varmint hunting is apparently only serious if it's past what, 300 or 400 yards according to you? I can't do serious varmint hunting under 150 yards? Better tell that to the 400+ ground squirrels I shot last month in about 1 day with my 223 and 17HMR. I guess it was only moderate varmint hunting, not "serious" varmint hunting?