The lines get larger because the reticle is being magnified so that it's values hold true through the entire magnification range. For most the complaint is that at lower power the reticle is almost unusable as it get smaller, Some reticles have thinner lines than others, so it depends on you. Trying to shoot 1/4"-1" dots at 100, 200, 300yds may be difficult with a low end FFP. Shooting 1 MOA or larger targets should be no problem though. If you are set on an FFP and wish to shoot tiny targets than I recommend trying to find one that offers a reticle with an open center or open center with a dot.
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