That is truly a mouthful of request. I have some Retumbo, no other cartridge to load for it other than perhaps 280AI. Has anyone worked up a load for Berger 168VLD's with Retumbo? Yes, I do realize that Retumbo is very slow burning but my Rem. 700 280AI has a 26" bbl. and should be capable of good burning ratio versus say H1000 or IMR4831. Can anyone offer any results they may have explored with this combination? Thank you in advance and happy holidays to this informative forum. MTG