I've found that when using Powershot and dual wielding, it would only do 1 shot. So, +5 damage or so for a shot less, actually giving you less damage.
As a result; I never use it in my games. Rapid Shot for the win.
Also, my HK is generally 28 at the factory, no problems.
Then again after TSLRP I am double so careful in making an excellent HK . Don't really need it here in TSLRCM though.