With varget I used mag primers and never had issues other than never getting varget loads to group well in my rifle, I switched to 8208xbr and it shoots lights out groups with that powder. As far as working up loads and switching to mag primers i did that with warm win748 loads worked up with cci400 26gr 748 and switched to cci41 and experienced no excessive pressure signs without a workup but thats for my rifle and my compomants ymmv



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