The best replacement for 55 grain is 62 grain.

The best alternatives to 55 grain are rated as following:
★★★★★  62 grain
★★★  77 grain
★★★  75 grain
★★★  65 grain
★  45 grain
★  62
★  64 grain
★  62 223

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Speaking about 55 grain, one probably shouldn't forget about 1 7 twist.

Other search terms related to 55 grain and their ratings are:
★★★★★ 1 7 twist
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55 grain
62 grain
77 grain