Ok, I understand where you are comming from.

I don't know what kind of 470 you have: modern or vintage, British or Continental. But that 470 can be made to shoot heat-treated cast bullets in the 370gr range quite nicely. That makes the ole 470 very fun to shoot.

If it is modern then I suggest you get a pre-war british rifle. In the sub $10k range is 450 and 500 BPEs. They are in a class among themselves.

If you want a modern rifle and I were you I'd get a 30-06 or something similar. I think this is the only way to get the weight down.

Champlins had a 450 BPE and a scoped 30-06.