Rem 700 trued short action, 1:12 twist, 24" Black Star Barrel, 1.5 oz Jewell trigger - 27.0 grains CFE 223 with 52 grain Berger - 0.274" groups at 100 yards indoors occasionally. I can usually count on 1/2" or less groups at 100 yards indoors. Outside with mild wind conditions - always sub-moa.
24.5 grains of VV N-133 will do the same - just a tad larger for the smallest expected group, which is 0.378"
Trued action - Match grade, hand lapped barrel - Jewell trigger - high magnification quality scope is almost a prerequisite for consistent bug hole shooting - just my opinion of course.