I have a 35 Whelen Improved (Ackley 40 degree) built on a commercial Mauser action with a 25" Douglas tube. I was wondering if anyone has a rough ratio on what is the acceptable percentage of powder charge increase to consider a maximum over the standard 35 Whelen. I have been handloading for 15+ years and recognize high pressure signs. I'm looking for a ballpark percentage to help save me some time at the reloading bench when trying new powders.