I too have a 3" Backpacker and love it but have yet to fire it with more than 8.5 grains of Unique and 240 SWC. I have some H110 loads that I shoot out of my Marlin 1894 and 5" 629 Classic but an kinda chicken to shoot the heavy loads out of the 3".
Can you possibly give us a link to one of the videos? That would be cool to see. I may have to get up the nerve.
Light off that 3", you'll love it.
