If you want 300 Whisper brass already formed go here-http://www.coyoteguns.com/once_fire_brass.htm.
Great quality and fair pricing and fast delivery.
I also form my own from 223 brass and aside from losing around 15% due to neck splitting they work fine. This may be a bit more than a really raw newbie may wish to do as you may have to check neck wall thickness and trim for lenght-things a really inexperienced newcomer may not yet have the skill sets to do.
Hope it helps and enjoy the new hobby.
Gary
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