Use heavier bullets! 62 grain should be your minimum, but aim for >75 grain for best results if you are into reloading. Everyone is disappointed with the HK SL8 when they use the default 55 grain rubbish. 63 grain RUAG 5.6 GP90 cartridges will give acceptable results, so will most NATO 5.56 ammo, as it should be 62 grain.