+1 for hanco's comments.
Nosler Accubonds in 140gr have been excellent in my 270 Wby (loaded at just under 3000fps). example: desert bighorn ewe, 1 shot at 547 yards. consistently accurate in my rig.
I've also shot 140gr Barnes TSX (not TTSX) with good accuracy and excellent kill results in my 270 Wby (1-shot deer kills at 260, 280, 370, and 408 yds), but I have seen markedly better accuracy with the 140gr Accubonds compared to 140gr TSX when practicing beyond 400 yds.
Nosler BT and E-tips and Barnes TTSX in 130gr also shoot accurately in my 270 Wby and 270 win, but of course have a lower BC and so I don't use 130gr in my 270 Wby.
FWIW, I would also take a look at Ballistic Studies' webpage regarding 270 WSM:
https://www.ballisticstudies.com/Knowledgebase/.270+Winchester+Short+Magnum.html?__utma=1.418551052.1511900138.1511900138.1511900138.1&__utmb=1.2.10.1511900138&__utmc=1&__utmx=-&__utmz=1.1511900138.1.1.utmcsr=(direct)|utmccn=(direct)|utmcmd=(none)&__utmv=-&__utmk=190358187
good luck with dialing in your loads.
