I am having a ball with my 17HMR shooting gophers and crows out to 200 yards with my Winchester Low Wall, an exteamly accurate rifle.
Not to hijack the thread but ditto that in regards to the HMR but on woodchucks for myself as a walking rifle and a set of shooting sticks. The low recoil sight picture of impact is priceless and the low muzzle blast appreciated, accuracy excellent. Up'ed the annie with a CZ set trigger,sporter, from my previous HMR, last spring and mounted a nice Burris on it. I have found the TN'T to be the bullet choice for larger varmints as it penetrates a bit deeper before fragmenting than the v max yet normally will not pass through and it tumbles then frags into a few peices at greater distance. Be sure and try the TN'T on Woodchuck, Rockchuck,Coon,Fox size game. I like the V Max on crows.
Very fun at the bench also. Sub moa 5 shot at 100 in calm weather with best groups in the .5's. At 200 yards it often puts 3 of 5 shots into an inch in ideal conditions but averages about 2 1/4 - 2 1/2 5 shot. Then at 300 for kicks we blow up small balloons about 6" -8" and pin them, practicing our come up and drift, once we get it dialed and if it's very calm out we can run several balloons before a miss.................hard to believe with a rim fire.
It's probably my favorite varmint caliber for what I do and enjoy.
In regards to the .204 and woodchucks topic.
My pal has a .204, hunts woodchucks avidly, and I have shot it allot but personally used a 22-250 for longish distance. His is a bolt action savage. He has tried various grain weights but settled on the 32 gr v max for woodchucks. He has taken to just beyond 400 yards. At about 325 yards is where you have to pay attention to shot placement with that caliber and bullet choice or they will make it to the hole. The recoil ain't bad but the muzzle blast is to high pitched and loud for my taste as compared to it's effective range. His shoots about .750" 5 shot at 100 from bench but seems to open up a bit at 300 as compared to 22-250's, .243's etc. Which is the distance we normally practice with for woodchucks using those type calibers.
Gets to the point for long range woodchucks, may as well get a .243 and be done with it. They are all loud and all have enough recoil that unless using a low power scope sight impact is not really clear as with the sub calibers and a .243 or 25 caliber does the job better at long distance.
A rim mag or Hornet for walking and a .243 or 25-06 for long distance pretty much covers it for woodchucks in realty. The inbetween calibers are just fun to have.