Today I got some new TBG. My heaviest ammo (rocks) is about 11gram. Same as 14mm steel. I checked out the TBG calculator and made my bands according to it. I believe it's adjusted to the new type TBG. Is it? <br><br>With the given measurements it shoots this ammo great but when I go to a lighter ammo I get a lot of erratic shots. When I switch back to the 'matched' ammo it works great again. <br><br>I did not have this problem with the tubes I used. No matter what ammo I used it would shoot it straight. I like it because I can shoot different ammo with the same rubber.<br><br>Do you have the same experience?