Have you tried a heavier powder charge with this bullet? Usually, when I see a group shaped like this it needs a little more "speed" to close it up. Your charge is right about the mid-point for IMR-4064 and if you haven't hit pressure signs, you might try a load closer to 44 gr.
With the 11.25 twist rate it leads me to believe that the intended bullet for that rifle is the 175 gr. With a 175 gr your target load would be around 42 gr using 4064.
>1 MOA isn't bad but with some tuning I'll bet you can cut that group in half based on my experience with a similar rifle, that powder, and 175 gr bullets.
Not being critical, just offering some free advice