I don't think you will find anyone that will take you up on this. There are liability and I think legality issues with someone else reloading your ammo. You might find someone that will let you come over and use their setup.
I do believe what you are asking is illegal. Anyone who does this is technically a 'manufacturer' of ammo in the ATFs eyes and will be in deep dodo. I don't reload for anyone at all except me and my son.
Reloading for a friend is not illegal. If there are no charges, commercial manufacturing is not considered. Liability issues can come into play though, making it almost impossible to get another to do it for you. Most reloaders will show you the ropes and let you use their equipment to do your own though.
If you're providing the components, all you'd need to spend is another $150 or so to get a kit from midwayusa.com and it would have the reloading press, powder scale, etc. Then $30 or so for 308 dies and you could set up your own. Or see if someone will let you borrow theirs. That way you can work up loads that work well in your personal gun.