From Three More For Africa, by Ken Howell, Handloader's Digest 10th edition

" ...The 375 Howell, the 416 Howell, and the 450 Howell are short enought for standard 30-06-length actions, not too large in diameter to be used with most magnum-face bolts, and powerful enough to give African hunters the power of the 375 H&H Magnum, 416 Rigby, and a souped-up 458 Winchester. Accuracy has been outstanding in rifles field-tested so far."

This was written at leat 25 five yrs ago I believe. "The parent brass was the 404 jeffery case-shortened to a final length of 2.50 inches, blown out to a nearly cylindrical body 2.069 inches long, with a 25 dgree shoulder to facilitate factory manufacture, and a neck about one caliber long inside." Ken Howell.

So here is my question (s). 1..Does this read familiar to some? It does to moi, especially what has be writ about the new 375 Ruger.

2. Why would a round like the 375 Howell or the 416 Howell not be chambered in commercial standard actions rifles, back then and now? What is the reasoning of large rifle makers, especially in the light of the new 375 Ruger's acceptance by serious hunters???? Someone in the know?

There have been a number of excellent cartridges over the years that didn't catch on but came back later with minor changes.

Couple guesses I would make are at the time the Magnum Belt was in. Both the M700 and 70 of the time were long enough to handle the H&H length case so over all length was not an issue. Short and fat was not "IN" and 404 brass was hard to find and expensive so the wildcaters didn't make it popular.

I think it has more to do with [ Office Trash }

When Howell made theese cartridges, .404 Jeffery brass was rather hard to find, and is probably the main reason for their lack of popularity.
The .375 Ruger is at least something new, but the .375 Dakota is an almost exact copy of the .375 Howell.

The availability of brass has always been important for any cartridge's popularity.

Like Jeffe's AR's, nothing new under the sun, exept that he uses dirt-cheep RUM cases.