"Pete C." fired this volley in news:53d5b563$0
:


Yes, but it will be close enough since I turned the OD at the starting
end

If you didn't need accurate drilling, why'd you call it "gun drilling"?

A 7" deep hole 5/16" in diameter ain't really much of a challenge,
anyway. A conventional "aircraft drill" would have turned the trick.

If you really needed it true, you'd have drilled it undersized and reamed
it to diameter, then turned it between centers to true up the o.d..

Lloyd