Blaser R8 offers 40 calibers in left hand models...
At those prices, they certainly should
By the time a guy finishes "fixing" his 700, he's likely spent 80% the price of a Blaser and still only has 1 rifle.
The R8S (non-removable fire control system) is $2,899 MSRP. That gives you access to all calibers up to and including the 375. A standard R8 adds the big calibers up to 500 Jeffrey.