Home Forums Hunting & Shooting Ask The Gunwriters 35 Rem vs. 30-30: Difference in max pressure

I'm trying to understand the difference in max pressure for those two cartridges, with the 35 Rem at 33.5K and 30-30 at 42K. What's behind my question is that I have a Marlin 336C 30-30 which I rebored to 35/30-30. Since I'm using 30-30 cases, I'm using that as max pressure in QuickLoad, but I'd appreciate knowing a little more about the difference, as many sources reference the 35 Rem as a starting point for the 35/30-30.