I plan on having a new long range hunting rifle built on a Stiller predator action. Barrel maker undecided at this time, Lija, Kreiger,Brux, all very good, probably a flip of the coin. I have two questions. First, what are the differences between the 7mm rem. mag and this new 7mm LRM? I assume the 7LRM is a new wildcat? Second question will generate lots of opinions. 7mm mag. verse 300 win mag at 800 to 1000 yards? It seems that most of the long range custom gun builders today,ie gunwerks, Greybull precision, etc really promote the 7mm over 300. Is there really any big difference today or just the usual personel preference?