B23,
No worries. I didn't think you were doubting me at all. I figured you were just curious about the ranges we shot them. It's difficult on a computer to determine tone and body language. If were were face to face, we would be having a grand old discussion and good time talking about it.
As to why I chose the HMR, well, it's just because I wanted to. I have spent most of my life in the groundhog fields with centerfires ranging from the 218 Bee, 223, 22-250 etc. to a 6mm06 and some wildcat cartridges too that blow them up like you mentinoned. I have used varmint rifles as well as Contender handguns. I generally shoot them up to the 400 yard mark, but I thought it would be nice to hunt them with rimfires and to make a movie of it.
My reasoning is that perhaps most hunters began at a young age with a rimfire in hand, probably a 22 LR, stalking game etc. Rimfires still hold a dear spot in the hearts of most hunters and there's a pretty good following on the net for rimfires too. The lowly 22 long rifle cartridge is very capable despite it's small size, with limitations of course. Everything has limitations. So, I set out to make a movie of hunting with rimfires only. We had a blast, no pun intended and I hope to do more of it.
So far I only have about 38 minutes of edited footage and I need at least another 25 minutes or so to finish it up. Since we used an HMR some in the video, I thought it might be interesting for some to see how it went for us and so I offered a free DVD to anyone who might like a copy. We also took about the same number of groundhogs with a .22 magnum. I will get a DVD out to you soon and hope you get some enjoyment from it. As well, I'm not suggesting that you switch to the HMR for chucks, but rather just to demonstrate what we have done with the cartridge and the fun we had.
Just to continue the discussion, the thing I like about the HMR is it's flat trajectory and accuracy. The accuracy potential of the HMR cartridge is well established, as is it's flat shooting ability on out past the 100 yard mark. That set a new level of performance when it was introduced and it is still going strong. The .22 mag is pretty good and even though I like the cartridge, I have never been able to get consistent accuracy from it like I have the HMR. The WSM is a relatively new critter that I have no experience with. I like the published velocity of it, but from what I am reading, it seems to be lacking a bit in accuracy compared to the HMR.
Considering the OP's requirement of one rifle for the species mentioned, I gave my personal thoughts about the three initial cartridges he mentioned, when used for both small game (rabbits, squirrels etc.) and groundhogs, and perhaps fox too. Considering accuracy, range and trajectory, killing ability etc., especially for groundhogs, I feel the HMR wins out. The WSM no doubt is a hard hitting and flat shooting number. I have a feeling it will make a good fox round for those who want or need to use a rimfire, but that is yet to be determined and another topic. But, it's lack of accuracy leads me to wonder if head shots are always possible on squirrels, or even on groundhogs when distances are approaching the 100 yard mark and further, so in my mind that puts us back to the HMR.
I did quite a bit of squirrel hunting this past fall with a super accurate little 22 long rifle. I had a wonderful time and put some good meat in the freezer. Here's a link to that.
http://www.predatormastersforums.com/for...-%20Post2871476 I could have used my HMR just as well for head shots but I had neglected the 22 for quite a while, so I wanted to use it instead. But, the 22 isn't my go-to choice for groundhogs, though I can use it effectively if I really wanted to. Distances would be cut considerably over what we do with the HMR.
So, I guess the above is my reasoning about the cartridges. Some may agree and some won't, and that's OK since we all like to do things our way. It's good to discuss these things, however which brings everyone together with ideas and thoughts.
As mentioned earlier, one rifle for all those critters is a pretty tall order.