I went out to the range this afternoon to do some shooting. Too windy to go long so I just shot 100 yds.
Here is a pic of my best group with my 280AI and the 160 gr AB.
3 shots outside spread is .376", .092" c of c.
My second best group measured outside spread .523", .239" c of c.
If the wind dies down, I'll shoot 200, 300, and 400 yds.