The best replacement for sniper rifle is hunting rifle.

The best alternatives to sniper rifle are rated as following:
★★★★★  hunting rifle
★★★  anti material rifle
★★★  beam rifle
★★★  huntsman
★★★  assault rifle
★★★  dmr
★  shotgun mass effect
★  rubi
★  shotgun borderlands 2
★  blaster rifle
  rubi borderlands 2
  ratslayer
  focus rifle

Your alternative for sniper rifle is not listed? Suggest!
Speaking about sniper rifle, one probably shouldn't forget about longest range.

Other search terms related to sniper rifle and their ratings are:
★★★★★ longest range
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Google Trends

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sniper rifle
hunting rifle
anti material rifle