Nsa,
How do you plan to hunt with the rifle?
The reason I ask is if you mostly ambush animals and don't do alot of walking, the weight won't be a big issue.
3-Lug bolts do pressure up when you start the lift; but It also has the benefit of having a shorter throw, so you won't get your hand into the scope either.
If you have several rifles that don't get used I would consider doing it, but only after I handled one and made sure it was what I wanted.
I have shot 4 Coopers, but only one was a wood stocked rifle. All were very accurate and very well made.
JM