Herbert & Zim: Thanks for posting. Funny, it looked different to me on the first set of pictures {on my computer they were dark and the shadows made the root look straight with a straight back angle to the handle shaft}.

In fact, your bolt is identical to the bolt on my Husqvarna M648. Same swept back shape. And, my 648 does NOT have a flattened underside. My 146 does, as does my son's .270. I do not know when my son's .270 was made. My 146 was made c.1939, but the action/bolt is an FN military configuration.

Anyway, Herbert, that is a nice, practical rifle in a great caliber!