Howa HACT in a Weatherby Vanguard ?

The attachment screw is in a different position relative to the alignment notch on the action between the new and old style triggers. It's around half the screw diameter difference, ~2mm. I think the attachment screw hole in the trigger housing could be slotted so it would work since the notch on the action aligns the trigger housing and the screw just clamps it in place.

I never took any exact measurements, it's not a drop in replacement, but it could be done. I've thought about doing the opposite and installing the old style trigger on a newer rifle.
 
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