before I joined SASS I already had all the gear, so being adventurous and a movie buff, I attempted said fanning. We have some land that we go shooting on, in a ravine, and we usually shoot at coffee cans, both sizes. Out of 6 shots, fanning as fast I could, I hit two cans. Never tried it again. This was done with a .45 Vaquero, with out action job.
Slip thumbing is faster and way more accurate!