I've shot 3 shot groups of H1000 and N570 through my 30-28 Nosler at basically the same rate of fire and I can tell you for sure the barrel is hotter to the touch after shooting N570. Personally the more I use H1000 in magnums the more of a fan I am it's very temp stable also.
Makes sense. N570 has a heat content of 4000 kJ/kg and H1000 has a heat content of 3630 kJ/kg. You'll get better barrel life from H1000.
