The best replacement for a307 is a325.

The best alternatives to a307 are rated as following:
★★★★★  a325
★★★★  grade 2
★★★  a36
★★  f1554
★★  a449
★★  f1554 gr 36
★★  grade 5 bolts
★  a193
★  j429
★  grade 5
★  a325 bolts
  astm a325

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a307
a325
grade 2