Re: Trick Arrows and GURPS Ultratech.
Blowing my own horn here, but you probably want to check out the article "The Arrow of Progress", in Pyramid #3/96, "Tech and Toys IV". That includes what you're looking for, plus a bunch of other useful ultra-tech options for bows and arrows.
To answer your question, armor-piercing hard core, armor-piercing hardcore explosive, high explosive, high explosive concussion, shaped charge, memory baton, high explosive multi-purpose, and strobe treat arrows as 25mm warheads, while biochemical aerosol, biochemical liquid, flare, tangler, thermobaric, stingray, swarm, EMP, expendable jammer, warbler, force, plasma, implosion, psi-bomb, stasis, and vortex warheads use the effects of 40mm warheads (since they can use the whole arrow, including the shaft, not just the arrowhead).
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