I almost gave my 270 away after sighting it in!
I was heart broken, well....... disappointed anyway. but I started trying different rounds did a few faq tricks and it did a little better. It likes the hornady 130 gr sp or sst.
However, I bought it to make long range shots(excess of 300 yards) and I have never got any groups that would justify trying anything like that!
It does the job inside 175 but my 35 rem Marlin will do as well.
Bottom line; try some different weight rounds but expect no miracles!