How long the ammo will keep depends on the environmental conditions and on how you store it. I know some people use airtight containers and dessicant dry-packs.
For setting torque, I use Borka Tools. Although there are many other torque drivers/wrenches than can do the job, Borka works great for my clumsy fingers.
I don't live as far away as Australia, but Becky called me within a couple hours of me emailing my inquiry. I know USO is very busy, and was pleasantly surprised at the speedy and friendly response.
Out of curiosity, have you or anyone else here tried the "dip"?
It's a solution made of one part vinegar and one part hydrogen peroxide.
Supposedly it's very effective, but also very toxic after it eats up the lead deposits.