Have never seen 7-30 Waters factory ammo in any of the local places, tho it is available on line. It is my new choice for whitetail hunting with a Contender, but for me will be strictly a hand-loading situation. The OP does not handload so 7-30 may be a poor choice. Go with a .243 or .35 Remington, which is also factory made in a spirepoint and Hornady is also making the Leverevolution .35 Rem with a pointed 200gr FTX bullet.
I may buy a .35 Rem Super 14 bbl next year.
The idea behind 7-30 Waters was to offer a flatter shooting cartridge in a lever action rifle and it was loaded with a flatnose bullet of 120gr.
It naturally moved into the single shot pistol arena because it was very effective but offered less recoil than 30-30, .44mag, and .308 in similar size bbls. Handloading is what really made the cartridge shine because a number of different bullet weights and styles could be used.