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What scope to use for 100 yard groupings?

4-16 FFP works for me with 5.56 because as my eyes get older than my old eyes already are; I need more magnification to see the reticle and my hits at 100 yards.
Properly adjusting your diopter may help you see your reticle. Also choosing a thicker one might help as well or consider illumination.
 
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Depends on the reticle.
And the target. But it mostly depends on which scope in on the gun. I have never had too much trouble quartering 1 moa dots with anything above 9×. Some reticles like the EBR7 I have to turn the mag up higher to see the center dot because I can shoot more consistently than trying to quarter a dot with it. What ever sig used in the tango 6 was like that for me also. I am not a big fan of tiny center dots. More mag isn't always better.
 
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Agree with above. Less is more. I would only buy scopes that were 30X or more. But after awhile, I realized I only used them up to 17-20X

But I will say, it’s nice to have some extra if you need/want it. Zoom in for spotting paper holes or steel impacts.
 
Properly adjusting your diopter may help you see your reticle. Also choosing a thicker one might help as well or consider illumination.
This becomes even more important the older you get. Younger eyes can more easily shift focus from the reticle to the target and back.

And once you use your diopter to focus your reticle on a blue sky or white wall don't touch it. Tighten the lock ring or mark where it's set or tape it in place. After that all focusing is done with the target focus/parallax knob.