14 of 16 .300 RUM factory loads carry 1,500 ft·lb and expansion velocity for moose; the best reach 850 yd (Hornady Precision Hunter 220 gr ELD-X). Ranked, with the drop chart for each.
At least 1,500 ft·lb at impact, ideally nearer 2,000, with a bullet that stays together. Legal: CO: 1,000 ft·lb at 100 yd, ≥ 85 gr. Floor used: 1,500 ft·lb at impact plus the bullet's published expansion velocity. Orange = a target or varmint bullet (construction, not energy); red = never carries the energy. Sources: www.chuckhawks.com, www.nhrifleman.com.