The 7 Allen Magnum is not only necked down but less body taper, the shoulder is moved forward and angled sharper. Then after all of that you get a custom chamber and tough brass to abosrb higher pressure.
With the 200 grain Wildcat bullet at 3340 fps it will blow through a full grown bull elk at 1K like a knife through hot butter
what changes do you make to the 338 Laupa case in the 7mm allen mag.
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Neck down to 7mm obviously, shoulder is moved forward slightly, shoulder angle is increased singificantly and body taper is reduced to min for that case size for most case capacity yet good extraction characteristics with top pressure loads.
it is quite a difference to sit a 7mm AM, or 300 AX or 338 AX next to their parent 338 Lapua case.
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