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Nearly Nano Saber does 1.5 less heart of damage than the RM Katar and the Musket. On this wiki page there is info on the damage of the main weapons in the game: http://thetekkit.wikia.com/wiki/Weapon_Comparison

RM Katar Does 11.5 hearts damage, RM Sword does 8 hearts damage, Nano Saber does 10 hearts damage (when on) 1 (when off) and the musket when loaded does 11.5 from point blank and gets progressively weaker the further away the target (6.5 from 50 blocks).