The AoR supplement Fully Operational has some explosives info.  Most are personal scale, one (Shaped Charge) has Breach, and one (Baradium) is planetary scale.  Multiple charges can be combined into one blast. Eg:  Detonite does 15 base damage on a success, and +10 damage for each extra "charge" used.  Setting the charges is an Easy Mechanics check, with +1 difficulty for each additional charge.  So two Detonite charges would do 25 damage (+ net successes), and require an Average check to g