So you happen to strap a bunch of admantium ball bearings to the outside of your bomb flask before adding the catalyst.
thats a world of hurt to anyone in the blast radius.
what about shaped bombs
if the bottom half of the flask is made of thick iron which tappers into a thinner neck, when it explodes the explosion get shaped into a directional jet of whatever is exploding. much higher impact in one direction.
heh could you bombs even improvise a cannon if the druid stone shapes a rock into a long tube pointed in one direction, load heavy metal object , drop in bomb behind it and BOOM home made cannon
any GM's had to rule on stuff like this for any of thier alchemists ?