I'm curious how your rifle shoots with other bullet weights? I only ask because I have the same rifle and found it to shoot best with bullets lighter than 55. 50-53 seem to shoot best in mine and it's never shot as well with 55 and heavier.
I haven't tried them. I do have some 50 grain Noslers I could try.
I shot 20 rounds into a single 3/4" hole today. 5 at a time as fast as I could load the mag.
