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I would recommend against playing mix and match with ammo at comps. First the POI often varies between ammunition. Second at some point you will mix up mags and step on your ####.
With all the costs required to get you to a comp the last place I would cheap out is bullets.
That said for CQB and 100m positional shooting practice 55gr is good to go.
75s shoot well in close as well as long range. If your plinking 55s are great but like GL said don't mix during a competition. One less thing to think about.