The 6.5x55 in the Schutzen stock would be nice.

Otherwise I would go for a "magnum" powered cartridge with a long barrel in such a nice lightweight single shot rifle. Not with a 23 inch barrel though. Doesn't list the cartridges they are actually chambered for.

If needing a more standard cartridge chambering I too would go for a classic like a .300 H&H Magnum. If a longer barrel is available, a minimum of 26 inches, and it was available, something like a 7mm STW but it is not a classic.

But if I was looking I would go for more crazy choices, such as the 6.5x68, the 7mm Super Express Vom Hofe, the .300 H&H Magnum.

The deluxe looks very nice.