Thread: 270 cal-which one??

I know this may start a passionate (read take the piss) debate about this calibre, Hey I've even jokingly thrown a little shade on the old girl myself in jest BUT....
In the real world is there any ballistic difference between the 270 win and the new 270wsm?
Yes I know ones shorter/fatter than the other one and is meant to be a little quicker. I also know that the ammo for the new jobbie is a bit more expensive also. Hence the question about ballistics only. And don't go near reloading-I'm begrudgingly considering that for my 303 because of interest alone
Don't even go near the 270wby-that does have a significant performance edge but not going there-way to pricey.
ok let the fun begin...