I have several ti, carbon rifles. The only one that weighs right at 6# is a short action Razor-ti , 24" proof sendero lite, in a bare mcmillan game hunter edge. I have a Mesa Crux ti, 26" sendero 30 nosler in a manners eh4 that weighs right at 7#. Manners eh1, kelbly, proof sendero 300 norma improved, weighs almost 8#. Have 2 Tikka in carbon stocks w/ carbon barrels, both over 7#.
The seekins saves all its weight in the aluminum action and 21" barrel. The proof rifles have ti action and Uber light carbon stocks. I'm not calling you a liar but a deviant ultralight is 28oz, bdl bm spring follower & trigger is another 5-6. The proof barrel is 48oz, ti brake is 2-3oz. That's 5.3 # w/o stock+ bedding. I think the lightest mcmillan stock made is 24oz.
My current build is on a razor ti long action(21oz) ag composites Visigoth (28oz) proof sendero 26" 7mm barrel (52oz) I'm praying for 6.5# finished weight. A true 6# magum rifle w/ 26# barrel isn't easy to do. If you've accomplished this on a steel action, my hats off to you!