Those are two of my favorite rounds!
http://en.wikipedia.org/wiki/.30-30_Winchester
http://en.wikipedia.org/wiki/.17_HMR
The .30-30 is perfect for deer here in the piney woods of south Texas.
When fired from the lever rifle, it offers about the same power level as an AK47 in an accurate, quick handling, reliable, economical package.
Millions of deer have been taken with this round.
The .17 HMR is fun!
It offers exceptional accuracy and flat shooting in a small package.
The bullet's trajectory allows the shooter to ignore bullet drop and hit within 1/2" of the point of aim from 25 yards out to 125 yards.
When shooting at squirrels, prairie dogs, targets, or just plinking for fun the .17 HMR allows the shooter to consistently shoot better than is possible with a .22LR.
The high velocity makes things like full soda cans or fruit explode.
Again, it's an economical answer to fun, accurate shooting.
I highly recommend you try both of these rounds out!