QuickLOAD says it adds about 2000 psi.
A reality check though: unless we know your actual fired case capacity, that could be off. Also, if your chamber has a short or long freebore it could be off. The way to get an accurate number is to measure case water overflow capacity the way I described and also your barrel length. Shoot a known safe load of that powder and bullet over a chronograph, and measure the actual velocity achieved on a chronograph. With that information QuickLOAD can be tweaked to provide a closer result to the real case in your particular gun.
Note the warnings that 48 grains is at or near maximum in the predictions. That means you want to back the load off 10% and work up to it in 2% steps to make sure you don't get any
pressure signs by the time you get to that full 48 grain load.