Remington
thought you might find this interesting..

https://www.ammoland.com/2017/02/458-winchester-magnum/#axzz4sZycfASH

ONE OF THE QUOTES FROM THIS ARTICLE:

The earliest use of the new round proved somewhat problematic. There were reports of the round not producing the speeds claimed, often leaving the muzzle at under 2,000fps. This was enough to negatively affect penetration, which is a must for a dangerous game rifle round. Some of this had to do because the stated ballistics were with a 26” barrel length, while most of the rifles used for this sort of work used 22”-24” barrel lengths for handiness.

Additionally, there were reports that the compressed charges of Olin Chemical’s early ball powder were causing erratic ignition. While these issues were corrected by the early 1970s as Olin Chemical owned Winchester’s ammunition brand and the firearm brand's manufacturing at the time, a certain negativity surrounded the round even though it was by far the most popular round in Africa due to a much-reduced cost of both rifle and ammunition compared to European offerings.