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I know this topic is getting beat to death lately... but I wanted to post my thoughts and get some opinions. I think I make sense, but there are way more knowledgeable shooters on this forum than me. I think when you compare the two rifles in an off-the-shelf purchase situation, the 7 PRC definitely has a slight advantage in that it's potential has already been maxed out in terms of seating depth for longer, higher BC bullets. The factory set-up in a 7mm Rem Mag has some limitations and you do have to seat bullets way deeper and into the powder capacity area, along this the slower twist rate compared to the PRC. But here are my thoughts... In a custom build rifle where you can choose the barrel, the twist rate and the throat length in the chamber... I feel like the 7mm Rem Mag has the advantage. I was getting really close to starting a custom 7PRC build and the more I researched the more I felt that in a custom rifle where you can maximize the COAL and extend the seating depth, I just don't feel like the PRC has any advantage at all. Am I crazy? With a 180gr Berger VLD, I get 2945 FPS out of my custom 284 Winchester and a 26" barrel. With my custom 7Mag, I am pushing to 3000 and I can't even seat as far out as I wish I could. I would like to push out to COAL of 3.600" and I am only able to get 3.400 in my rifle. I think if you build a rifle that allows for the max length... you would actually best the 7PRC. (Both of my loads are using 7828SSC powder). I would love to hear some thoughts on this.