I just got a savage 17 HMR, heavy barrel, synthetic stock, and I was wondering what as far as group size I should ecspect, I've been told that this is an extremely accurate caliber (dime size groups at 200yrds) I find that hard to believe though. And is this the kind of gun that you should be cleaning all the time?(50, 100, 200rnds...how often to maintain good accuracy?) I know nothing about this particular caliber any other info would be nice to..