i'd carry a 10mm handgun if sig sauer would make a gun for it, but the gun choices are very slim when it comes to 10mm unfortunately, i shot a handgun in that caliber before and i think its better then 40 s&w but there has not been enough different firearms straight form the factory with 10mm option
if you reload ammo you have to be realy interested in reloading in order to keep it up and make it worth the supplies, for about $300 + you can buy a basic reloading set-up, you will probably need at least $50 to $70 more worth of equipment to have permanent set-up that will do everything you...
i wouldn't mind learning how to reload, i only shoot 9mm ans 22lr now and would offer what i can toward your supplies so i would only be able to supply 9mm brass casing for the time being