First off I wanted to thank everyone that helped me in my previous thread asking questions about reloading. They were all a big help.

Ok heres my newbie question... I reloaded two bullets 160 sierras and 160 nobler partitions for my 7mm rem mag and I am using Hodgdon H4350 Powder. The amount of powder ranges on the Nosler from 53.5 to 55 grains and the Sierras are using 59 to 60.5 grains of powder. I haven't shot any of them yet so I made ten rounds for each half grain to try and see if I can dial the gun in. Anyway, I have noticed that I can hear the powder move in the brass casing when I shake the bullet... I used a digital scale and it was zeroed with the tray on it and I measured each throw before putting it in the case.

Is this normal or would they be unsafe to shoot?