Try one of these for dry firing practice:
LaserLyte Laser Trainer Cartridges - LT-9, LT-40, LT-45 and LT-380 | Up to 30% Off 4.3 Star Rating w/ Free S&H.
It seems like a lot of money, but will save you $$$ on ammo and aggravation. I shoot USPSA matches and everyone I know who is good says dry-fire is the way to perfect grip and trigger control. I never believed it until I tried it, and now I know it works!
Just paste a target on your wall and try doing 50 shots a night and you'll see the laser beam hit where a bullet would have hit. It will teach you more in a week of dry-firing than a bunch of ammo thrown down range.
You don't need to buy their expensive reactive targets, just the $75- 90 dollar cartridge. PS...I bought the cheapos first and they don't work as well!