I have never had an issue removing the weight bolt from a Schon. I know some have. Simply remove the set screw that holds the bumper in and try to unscrew the weight bolt (need a big flat-faced screw driver). Once removed, it depends on whether or not the screw is aluminum or steel and its length. If it's steel and over an inch, you can probably remove 1oz or more by replacing w/an aluminum screw.
Note that you should replace the screw with whatever material you like, but it helps hold the buttsleeve and butcap together, so it's functional not just a weight bolt.
Find a scale and weight the weight bolt vs. the new weight bolt you plan to use to tell you the difference it will make. I have heard of up to 2 ozs removed due to a long steel weight bolt, but what you currently have will dictate the change you can make. Balance will change the more weight removed or added, you'll just have to experiment.
Dave