Are you using a mag. ? If so try carefuly loading one at a time. And check for damaged bullet tips. Also check your parallax, don't just use the AO 50 yd. mark.
WHEN LOOKING THRU THE SCOPE _The dot does not change size. WHEN LOOKING THRU THE SCOPE -Its the same at 50 or 800 yards. WHEN LOOKING THRU THE SCOPE - the bullet hole is much bigger at 50 yds. than at 800. Thus the dot does appear smaller at closer ranges - WHEN LOOKING THRU THE SCOPE. I'm not...
http://www.mwerksllc.com/. I don't see it on the web site so you will have to give them a call. They make a really nice bore guide also. I'm pretty sure they are the ones that were selling them at gun broker.