After the Test server guys modified the H44 guns, you can now 1 shot or 2 shot almost any other BB. All KM BB players should be thankful for that. I'm not going to talk about range, AA capability, sling shot, etc. that make the H44 deadly.
As Jojo and Myg0t said, you may be playing your KM BBs in a wrong way.
Best regards,
Ade