Quick range report. I was able to get out today to test a couple of different types of .223 factory ammo. Here are the best results I got, I shot at 100yrd and 50yrds because a 1-6 Vortex doesn't do the best for tight groups at 100yrds.
62gr Fusion
100yrds: .755" 4 shot group
50 yrds: .848" 4 shot group
55gr Hornady steel case Training
100yrds: .546" 3 shot group (pulled one shot that opened up the 4rnd group to over 2")
50yrds: .708" 4 shot group
62gr PMC X-TAC (green tip)
100yrds: .815 3 shot group (4th round flyer opened group to 1.5")
50yrds: .934 4 round group
75gr Hornady Steel Match
100yrds: .924" 4 round group
50yrds: .818" 5 shot group (best 4 shots were .383")
50gr Sako Speedhead
100yrds: 1.332" 3 shot group (that was the best 3 shots not sure what happened there)
50yrds: .677" 4 shot group
Side note: The Sako rounds did more damage to my AR500 targets than anything else. I put two rounds on top of one another and just about punched a hole through my 10" 3/8 thick gong.