From the op's name, would guess reloading is already a hobby. If not, it should be. Anyway, most already mentioned, but here's some of mine for ideas.
Some of my current hobbies....
Knives, of course: buying, tinkering, anodizing, sharpening, etc.
Guns: shooting, reloading.
Leatherwork.
General, putter about tinkering.
Motorcycles (street & dirt, but more conservative).
Silversmithing: small bullion pours and some jewelry (also some copper).
Minimal woodworking.
Some that I'd like to try...
Lathe work: bowls, pens, etc.
Welding and other metalwork.
Forging.
Engraving (laser and contact).
3D Printing.
Carving.
Some Past Hobbies:
Flying (private).
Skydiving (actually more "events" than hobby as I never certified).
Paragliding.
Motorcycles (bit more aggressive styles).
Rock climbing.
Skiing/Snowboarding/Instructing.
Scuba
Embroidery (the hardcore kind....no really
).
Gold plating.
Obviously my current life is a bit more sedentary. I was a little hard on my body in years past. Now paying the price.