Strictly speaking, the best you can get is not quite enough.
Indoors, muffs over plugs are the way to go.
HL Impact Sport is only 22 dB, not much. HL Impact Pro is 30 dB, much better.
They are not very comfortable to wear and I only use them when I must hear conversation. Otherwise it is one or another 30+ dB passive, which weigh less and cost less.
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