The best replacement for pentax 55-300 is tamron 70-300.

The best alternatives to pentax 55-300 are rated as following:
★★★★★  tamron 70-300
★★★★  sigma 70-300
★★★  sigma 70-300 apo
★★  sigma 18-250
★★  tamron 70-200

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pentax 55-300
tamron 70-300
sigma 70-300