I checked your You Tube and can't find your gel test with the cavity back. Would sure like to see it. I don't reload myself so I'll never use one but I love the distance you do with the ribs in front.I've been using the CBB 120's for a few years now with great results. Can't beat the expansion, I've gotten .65" at 300 yards in gel. I have a box of 105's I've been meaning to do some testing with.