Sir Ron,
Thank you for the simplifying the details on barrel contours.

Perhaps, a PacNor #5 or a duplicate of the 416 Ruger Alaskan is what I am looking for. I am thinking 21" length. Splitting the difference on the indecision of 20 or 22.

For conversational purposes:
I will dig out an early 375 Ruger African, without sling stud barrel band, presently in a B&C and weigh it within the next couple of days.