Serious drill bit purchase help!

1904 Marlin octagon barrel family heirloom, a candidate for a reline if there ever was one. Exterior of barrel marked in beautiful fine script of another century and pure American pride in workmanship.
The making of the "D" drill is not as scary as the heat treating afterward. Eek.
 
Ahhh... when I hear .22 I picture LR AR style. If it’s an heirloom, you gotta do it right.
 
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