I used the 2.75" Remington Aero Tips the past 2 years. I get 1.5" groups at 100 yds with them. They always worked. The most accurate in my Encore were the 3" Winchester Dual Bonds. At 100 I got .75" groups, and 1.5" at 175 yards. But they seem to be out of production, and the 2.75" Dual Bonds weren't accurate in my gun. I just found the Federals this year. I used to shoot them in my Browning 12 gauge A-Bolt and they were great. The 3" in the 20 gauge give right at 1" at 100, and under 2" at 150 yards. This was the first deer I've taken with them, (20 ga), and I was impressed.
I have only shot these to 150 yards so far. They average just under 2 inches at that range. My Nikon 2x7 scope is dead on at 140 with the BDC reticle. I plan to shoot them out to 200 soon.