most .45 ammo is subsonic, easier to suppress. 9mm is popular as well but to get the best suppression you have to use 147gr, 158gr subsonic ammo. 124 and 115gr can be suppressed but not as effectively. .40? hk is the only manufacturer to make a reliable .40 caliber suppressed weapon but i would imagine .40 cal subsonic ammo is hard to find (i dont shoot .40 so i am not sure about this).
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