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Bolters do have a kicker charge.

Gyrojet is likely the proper term for our frame of reference.

It's not an autocannon. It really is a small, rapid firing, rocket launcher.

You're assuming they're working with tech and materials we have access to. The IoM has had lots of time and alien tech to examine in order to get to where they are...mostly courtesy of previous eras, but they still have access to it.

Actually, there are a number of specialty bolter rounds in the Imperium. For anti-nid use a specialized needle round containing a 'mutagenic acid' which was especially effective. Curiously enough, it was found equally effective against ANY organic target. Then there's the Kraken rounds which...

From the design, the diamantine tip is the penetrator, and it's reinforced with a depleted deuterium core that's filled with whatever the explosive charge is made up of. I don't think that the non-SM rounds are any different than this standard composition.

I think your mass measurements are pretty accurate. Where we're off is the nature of materials used. I've often seen special materials listed for the metal used in the penetrator as well as explosive compound. Then we get into all the special rounds that are available. <I'll sideline those...