Weight is a critical part of any rifles setup but where should weight be put?
18lbs is still very generous and there are alot of options of ways to put that mass to work.
Although I don't shoot on a Remple, I have seen them and have been very impressed with its design and more importantly, its function.
If the bipod used has any level of flex, it will not give the shooter all the consistency they would want.
Personally, I think some of the biggest places to loose weight is in the stock, base, trigger guard and rings. I can't see why you couldn't free up 2 to 3 lbs with careful parts selection.
I am in the midst of designing a F TR rifle and have my thoughts on a better mousetrap.
One of my design parameters is keeping the mass as low as possible. A light and potentially flexy bipod to allow the use of an overly heavy scope could make the rifle very top heavy and increase the effects of recoil torque.
As always, YMMV....
Jerry