The Savage .17HMR is a better rifle in my opinion, and it sounds like you're using it for gopher work. The .17HMR has a better "effect" on those buggers than a .22lr too.
Money is money, so let's talk about that.
If you're tight for $, you're actually taking a step-up in terms of gun costs and no matter what you sell your HMR for, you'll still need to kick-in more than $100 (probably more) to get into that SR22~a gun that doesn't have the reach, accuracy, nice trigger, or punch that the HMR has. I was 15 once (27 years ago

) so I understand the appeal of the SR22, but there are plenty of semi auto .22s that cost 1/2 (or less than that) of what the SR22 costs. I just bought a Marlin 795 for $125 (including tax) that out-shoots any factory 10/22 I've ever used, and you could 3 or more of those for the cost of a Ruger SR22.
If you haven't already, take a look at what your rifle sells for used, then decide if you have the cash to make the step-up to the SR22 and go from there. Good luck!