Nope. The test barrel makers use (or at least, used to use back when it was done mostly by hand) was a big window with windowframes in it.
Look down the bore, out the window, into the sky. Move the barrel until you have the line of a pane frame in sight.
the line of the frame, running down the bore, will show if the bore/barrel is straight, or bent.
The old hands would sight a barrel, then use a barrel press to straighten it, and check again. In the better shops, if it took more then a couple of attempts to straighten it, the shop foreman would find out who the klutz was; the straightener or someone further up the line.
Look out your window, with something straight in view. use that, and get back to us. If you have any questions, use a barrel you know to be straight as a comparison.

