new to the 300 whisper

[deerhunter]

I am new to the 300 whisper and dont know anything about it. I am looking to buy the 300 for my son to deer hunt with in alabama. I have call the gun stores around here and nobody can give me any help the say they havent ever heard of it. What do i need to get started reloading for this bullet? What size brass do I need? I know this post may sound stupid but I just need some help.