I keep reading where the NEF 45-70 is only capable of handling lever action loads. Why is this?? NEF chambers their rifles for 500 S&W and it operates at a max pressure of 60,000 psi and launches a projectile up to 500 grains. In my mind (and quick loads) the muzzle blast, internal pressures and recoil will be the same as 45-70 using ruger #1 load data. Am I missing something??