458 Express
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Drawing in metric size of the straight wall .458 calibers
Top to bottom: .458 Express, .450 Watts, .458 Lott and bottom .458 Winchester Magnum
The greater length of the .458 Express is clearly evident in this 1:1 scale drawing allowing for more propellant and also different propellants than in the smaller calibers. This drawing really makes me wonder why Winchester never adopted the Watts caliber?
Download the drawing in TurboCad format:

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