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I think you’ll be close with those components but probably won’t be under 8. A friend just had Gene Simillion build him a 300 Win mag. Used Legend with Edge shell and regular fill, 24” Krieger #2, Blackburn bottom metal and Gene’s custom steel mounts. With a 3.5-10 Leupold it hits 9lbs even. Take off the scope and it’s about 8.25 lbs.
The Blackburn metal is nice but heavy. If you want it under 8 you should go aluminum (drop 4 oz) and a #2 Krieger. I’ve weighted these parts since I have them sitting here for a build and this is the only way you can make it under 8#s
