I think my choice would be:

Savage '99 in .25/300 or .300

Mauser '98 in 9.3x62

Mauser '98 in .404 Jeffry

Win M70 (Pre-64) in .30-06

I choose these because people actually used them (chamberings)in significant numbers. And they worked! The Savage is just prettier than the Win '94. And a better rifle: balance, mechanism, ability to use sharp pointed bullets.

For the doubles, it would have to include 9.3x74R, 450/400, 470. After the British state banning .450 in Africa and India, I guess these were the most commonly used rifles. Type of double?

Greener, top bolted, as in his book: The Gun & its' Development.