by Vness » Aug 22, 2009 Hello everyone! I am hoping someone would be able to answer a small question. I currently have a S11 I .54 RB (5.20mm x 5.28mm)...I am curious as to how much bigger a .75-.80 RB would look. I just would like to know for future reference when I do decide to upgrade. We wouldn''t want to spend MUCH more then we already did, but make it seem bigger. Thanks in advance for any advice!