I've made a free, downloadable PDF Spec Sheet of most of the tuba rims I manufacture. Included are the profiles for Sellmansberger and Mouthpiece Ordnance (formerly Loud) lines. Make sure you have the latest Adobe reader. You can select any number of rims to superimpose and get a visual to see if it jives with what your chops may have been telling you for years.
This was a pilot project and I plan to expand the rim offerings over time and ultimately make similar efforts for other instruments. Your feedback will be greatly appreciated.