I don't have the money to waste on a chrono graph so I'll take the manufacturers word for it.
If you are talking only factory loads as it appears that you are,try and find a 270wsm factory load that shoots flatter or rfetains more energy than the hornady 139gr heavy mag interbond load for the 7mm remmag.
https://www.hornady.com/shop/?ps_session=8847f4c88c4b415e8e585ce724db8b73&p age=shop%2Fbrowse&category_id=5bc2df448258be45 fb6bd9ce8eeee93d
As for me,I will keep shooting my 7mmstw's.They drive a 140gr bullet at 3500fps(actually chronographed) which is well beyond what the 270wsm is capable of.