Think about some of the stuff in there and when it was developed, the 375 was before WW1, the 30 super was around 1920-25 range, both are still around, the 375 is still going pretty strong at over 105 yrs old, 300 not so much maybe, but still going at 90 or so. Believe 1958 was around the time the 300win mag was released, 7 mag 4 yrs later, Weatherby stuff was around, 460 released the year before, 240 was 10 yrs later. They were still building 450's. 465 and 475's, 458 win was only just out, two yrs before the catalog.
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