Two sites that will give you more info than you can digest on the 17HMR .
This is also a good ballistics calculator if you want to figure different sight in ranges and wind deflection at different ranges. Mine is sighted in for 110 yards.
Big Game Info
I don't remember the BC off hand, but you can find it on either of the sites above, or on the hornady's site. They are listed at 2550 fps, but usually shoot closer 2600 in most rifles.
If you have the 17HMR and want to hunt tree rats for meat you should look into the CCI hollow points, 20 grn Game points, or the newer FMJ bullets. The V-max's will darn near blow one in half at most ranges. Head shots are must if you want the meat.
If you have the 17HM2 it is a really great round for them from what I udnerstand. Better range and accuracy than a .22LR and not as much damage as the HMR.
I have a savage heavy barrel and love it.