The best replacement for royal crossbow is zaryte bow.

The best alternatives to royal crossbow are rated as following:
★★★★★  zaryte bow
★★★★  armadyl crossbow
★★★  hand cannon
★★★  chaotic crossbow
★★★  dual chaotic
★★★  ascension crossbow
★★  dragon crossbow
★  queen black dragon
  warsinger bow

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Speaking about royal crossbow, one probably shouldn't forget about ascension bolts.

Other search terms related to royal crossbow and their ratings are:
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royal crossbow
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