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But I'm a draftsman who converted LOTS of ordnance to GURPS for Twilight: 2000.
The controversy at hand is a claim that the PGU-28A/B 20mm SAPHEI (semi-armor piercing high-explosive incendiary) is as good as a hand grenade.
One poster commented that a grenade the size of their thumb wasn't very impressive.
Our pilot countered that an M67 fragmentation grenade had 6.7 oz of explosive and the PGU-28 has 4.5 oz.
I remembered how the 25mm round for the XM25 was often criticized for a lack of boom so I wondered if our pilot was correct.
So I looked up the PGU-28A/B.
The manufacturer says the total projectile weight is 3.5 oz. That's the body, explosives, detonators, incendiaries, tracer, the whole shebang.
I also found a drawing of the round:
If you scale that you'll find the Comp A-4 filler is 11mm in diameter and 24mm long. That gives us a mere 0.21 oz. of explosive. Not a big boom.
Also any fragmentation is going to come from breaking the projectile body instead of using a pre-fragmented wire, like the M67. That's uneven and erratic fragmentation, and there won't be much of it.
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