This is blasphemy.
That said, I reckon you have a good reason.
Do you mind responding to the questions about what type of shooting and hunting you want to do, and maybe a bit about why you need to trim to 4 rifles?
Do you need to raise some money for something? That argues to sell the .358 M99 as it is certainly worth a bunch, but I'd sure hate to let mine go - leaving tomorrow on an elk hunt with it.
Are you downsizing your home? Dealing with mortality and taking some strain off your heirs (bless you if so, though we all are aren't we)?
What kind of rifles make you the most happy? I think we'd all like to know your circumstances.
Cheers,
Rex
