Greatly nerf the damage and/or soldier protection. I believe most fans agree a system like Arma 2's where rounds often kill too reliably is much more manageable in a tactical game than a system that is not tweaked and balanced and results in rounds not being immediately deadly at all in many scenarios. In summation, enemies with 'glass jaws" are more conducive to a positive experience than bullet sponge enemies if we can't have an ideally realistic damage system.
Due to distance being the determining variable, perhaps the ballistics values on those rounds are too pessimistic?