[durdensfriend]

I own 3 semi autos (Springfield XD 9, Walther P99 .40, and a Walther P22). I shoot the Springfield and the P22 fairly well but I shoot low and left with the P99. I've been practicing the trigger pull by dry firing at home but I was wondering if it is better to practice with dummy ammunition (like from dummunition.com) to protect the firing pin. Does anyone have any experience with dummy ammunition? Do I even need to use it? If it is reccomended that I use dummy ammo, which kind is best? Thanks for helping a noob!