Suggest sporting 'noise cancelling' earmuffs, Peltor Sporttac are one and there are others on the market. Or earplugs work, but while suppressors reduce the impact of the sound waves on your eardrums and minimise the potential for hearing damage it's still on the painful end of the noise spectrum.
As others have suggested subsonic ammo is for specialist and usually short range work, best to stick with the full power ammo for animals as it's much flatter shooting and hard hitting.
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