Deer sure. Boar? No way, not from a 7STW. Likely to act like grenades at that velocity. If you just gotta shoot such a gun then you need to accept that premium bullets go with the territory.
I might consider the new Interbond 154 or a Nosler PT or Accubond of 160 grains or more. If you were shooting a 7x57 or 7-08 then I'd say sure go for it but be careful of shot placement. But not with a 7STW.