More power out of an M203 shells, by covering the holes?

[Fox Hound]

This seems logical. If i plugged the holes of my shell, i would get the more pressure comming out of the barrels, correct?



im not saying, all but 1 but just covering 4 holes. Now how would one do that? I'm planning on doing various test with this massive shell. trying to get the best range out of it. Most of the times i spreads 40 feet apart at a distance of 80 feet. Very impressive indeed, i cant believe no one ever thought of using c02.