I found some 9mm ammo in wal-mart. Federal and Remington. one box was 50ct for $9.47 the other was 50ct for 11.47. I bought three boxes of each as that's all they would sell me. Upon looking at them, one is slightly longer than the other. (or shorter than the other depending on how you look at it...lol) Both boxes are labeled as "9mm Luger" so I assume either one is correct right? I just want to be sure it will work in my G19. Is one too long and wrong kind of ammo or it that just one is simply made shorter than what its supposed to be? I am not in my home town (in a hotel for the night) and Id like to go back in the morning to buy more as the Wall-marts in my home town never have any in stock. Thanks..