That group doesn't look bad. Time at the bench and practicing the fundamentals can get the group tighter. Keep in mind that each rifle can tend to have a particular preference for a brand of ammunition it likes best in a given bullet weight. Some will eat anything you put in it and shoot it pretty well. The only way to figure that out is try different brands of ammunition but only after you've gotten the maximum potential out of yourself first. You are going to be the most inaccurate part of the firearm.


Control your breathing.


Pull the trigger at the same point in your breathing. If you fell more comfortable letting your breath out before taking the shot, do that. If you feel more comfortable at letting out half a breath, do that.


Practice your trigger pull. Slow and smooth. Don't anticipate the shot.


Practice your follow through. Don't release the trigger until the rifle settles down after the shot.


Do everything the same way every time and adjust one thing at a time to isolate what works and what is causing accuracy problems.