SST's never ran in my rifles. They are a VLD bullet and to seat them near the lands you'll run out of magazine on some guns.
Your gun acts like it has a bedding, action screw torque problem. Start with them TIGHT and then back off a bit if it doesn't run.
To make sure I'm not canting the gun, get targets with grid lines and use a level to make sure the target is level. Then make sure your vertical crosshairs is aligned with the target on every shot.
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