RE: Do you always use Magnum primers in your Magnum loads?
I just learned the art of reloading from my Dad who has been doing it for over 35 years. I asked him about the different types of primers. He mostly uses Federal GM215M and I am using that too. But he has other rifles that the GM210M work better. Recently he has started trying CCI brand and finding it to work as well on some rifles. My Dad said that just like every rifle is different, each type of primer can cause a different result. You can only know how your rifle will respond by trying each primer.