Yeah, that's one of those things that could probably use an example box. It's a very "Oh, no [i]doy![/i]" thing when you figure it out, but it can play merry hell to figure out. It's worth pointing out that weapons with a Uniform Blast are the same, it's just that their damage falloff doesn't begin until the edge of their Uniform Blast template. As an aside, HEAP Seekers are [i]very[/i] badly named. High-Explosive Armor-Penetrating rounds are designed to punch through a target's armor first, like a conventional AP round, and then explode, whereas the description of HEAP reads more like HEAT - High-Explosive Anti-Tank, which explodes before the target, using the explosive force to drive a jet of molten metal into the target.

Also, as discussed in several other threads, there aren't a lot of actual MBTs rolling around you'd use a HEA[i]T[/i] round on. HEAP sounds more broadly applicable. And there are HEAP rounds which use the detonation to soften and propel a penetrator. (Though if I've read it right, technically that has an [i]I[/i] in it because they're loaded with Incendiary compounds) That also implies there's no linguistic drift like 120 years into the future.