Have owned guns all my life and never had a need for Snap Caps. I recently purchased a Sig P938 and I love everything about the gun except the trigger pull. Was suggested that I buy some snap caps and dry fire A LOT and maybe that will help. Could I just use a empty 9mm case or is snap cap a must. Also, do you think dry firing a few hundred times will really help or should I just take it to a gunsmith?