No the dremel can take too much too fast. I start with the mag in the gun, and draw a line around the floor plate. Use the butt of the grip as a guide, so you don't take too much away or have to keep inserting the mag to check.

I start out using emory boards or a file. When you get close to your mark switch to sand paper to get the deep sanding grooves out. It takes a little time. You can always take material away, but you can't put it back.