IIRC OPFOR classes in the Army:
If you try put a BMP round into an SPG-9, it won't fit.
If you put an SPG-9 round into a BMP-1, the smaller round will not develop enough pressure to launch properly, and will not even leave the chamber of the BMP-1's gun. However, the fuze will be armed, and heavy burned propellant fumes will fill the interior of the BMP-1 when you open the breech again.
Apparently, some fool has tried those things in the past!
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War is the absence of reason. But then, life often demands unreasonable responses. - Lucian Soulban, Warhammer 40000 series, Necromunda Book 6, Fleshworks
Entirely too much T2K stuff here: www.pmulcahy.com
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