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458 cartridges for heavy low drag subsoics.
These are all are similar in performace in order of case capacity.
cartridge h20 length max-psi case type head
450 Marlin 79.0 2.080 47862 belted mag 458 WM
458x2 Amer 73.0 2.000 59988 belted mag 458 WM
458 Socom 61.6 1.573 35000 rebated 308
458 Whisper 60.0 1.750 45873 belted mag 460 Wby
All have good and bad points. For my experiments I want a high pressure rating. The SAAMI ratings are more for the type of firearm they're expected to be used in than any limitation of the brass. I didn't believe the 458 Socom or 458 Whisper would feed from a Rem 700 magazine very well either. It was the availability of dies and reamers that made the final decision for me.
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