The Taylor loads I used were fully the equal of the original Rigby loads. Pressure is the same as a 30-06 or 300 Win mag. Quite a bit higher then the pressure of the 1920s Rigby cartridges, but that doesn't matter because almost all shells used today run the same pressure as the Taylor including the 30-06 7MM Mag, 338 mag, and 375 H&H. Here is a link to look over the loads. Go to page 16.