Personally I think you're totally on the wrong track with all of that.
Keep the 75 as is, and buy something else lighter.
One of my rifles is a old m595 tikka, very similar to your 75 but a short action. It's an awesome rifle, but was heavy. I've fitted a McM CF stock which reduced weight a reasonable amount but it's still my heaviest rifle.
A Forbes or Montana in 308 would be very hard to go past.
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