The scope on that rifle is pretty similar to the one on my custom Joh Springer Mauser in .270 win made in Austria close to 100 years ago. The claw mounts are soldered directly to the original Kahles scope tube making it it a truly custom scope that cannot be replaced.
My scope was fuzzy, dirty and would not adjust so I sent it to L&K scope repair (
http://www.lkscoperepair.com/) whom came highly recommended and promised a 2 month turn-around for a complete overhaul for $250.00.
Without that scope my rifle would be relegated to a safe queen with a much diminished value.
I am eagerly awaiting it's return to make Dad's baby whole again.
Agreed.
The answer very much depends on the firearms intended use.
5.56 is much cheaper, available & lighter.
300 B/O is expensive (reload if you can), heavier & generally not going to be available on the enemy's carcass (particularly zombies).