The best replacement for grendel is beowulf.

The best alternatives to grendel are rated as following:
★★★★★  beowulf
★★★★  308
★★★★  spc
★★★★  creedmoor
★★★  6.8 spc
★★★  parandus
★★  6.8
★★  .308
★★  5.56
★★  300 blackout
★  beowulf compare contrast
★  6.8mm spc
★  6.5 creedmoor
★  bigby
★  .50 beowulf
★  blackout
  264 lbc
  6.8 spc ballistics
  300 aac blackout
  223
  6.8 rem
  260 remington
  beowulf battle
  6.8 remington
  260
  6.5mm mpc
  hrothgar
  creedmore
  green knight

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Speaking about grendel, one probably shouldn't forget about beowulf.

Other search terms related to grendel and their ratings are:
★★★★★ beowulf
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