Re: The Future of Small Arms
Okay, I can see those answers (but note that while explosives will have improved in 300 years, so will materials tech for rigid defence plates). But even with those as a given, you're still gilding the lily. Pure kinetic impact is the name of the game - it's so simple that it's very hard to defeat. Modern Body armour, after all, beats pistol rounds - but NOT long arms.
You'd be better off using all that explosive to throw the bullet further, faster and harder. More damage, more penetration, and far harder to stop.