re: Reloading question 270wsm 300wsm

NOLAGT,
Welcome (potentially) to the wonderful world of handloading/reloading. Yes, if you already handload for the 270 WSM and add the 300 WSM to the party, there are a lot of tools that would be used for both calibers, including:
Press and case holder (press is prob the single most expensive tool)
Primers
Priming tool and primer case holder
Scales (depending on type, this would be your 1st or 2nd most expensive tool).
Dial calipers
Handloading books
Powder(s). There are a lot of powders that are commonly used in both the 270 and 300 WSM, but you wouldn't know for sure w/ your guns until you started load development.
Trimming tool, depending on type.
Case mouth chamfer tool

Items that would be different:
Brass (although a knowledgable handloader could make 270 WSM to 300 WSM and vice versa). If you've saved your shot 270 Win you're off to a good start already. Brass will prob be your 3rd most expensive item.
?Powder (see above)
Dies (each caliber will use different dies. New dies cost $30-$60 or more/caliber)
Trimming tool, depending on type.

If I had a 270 WSM, my main reason to handload would be to assure myself longterm of easily available ammo. I'm not sure yet which (or any) of the WSM's will be here long term. Buy #100 pieces of brass and you'll have a lifetime supply. I tell new handloaders NOT to expect to save money by handloading because you'll find themselves shooting more. Keep us updated. I'll gladly share anything I know!