Hello all, I recently purchased a Simson drilling made in the late 70’s. It is chambered for 12 gauge 2-3/4” on top and 6.5x57R on bottom.

During the past few range sessions, I’m getting groups that vertically string about 2 to 3 inches (shot at 50 yds) with several different powder and bullet weight combinations. For optics, I’m using a new Leupold mk3 mounted with EAW swing mounts.

Have any of you guys had this issue while shooting drillings? I’m wondering if this is just the accuracy I can expect from a drilling, or maybe I’m shooting to fast and the heat is causing the stringing? Any incite on this issue would be greatly appreciated.