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From Terraria Wiki
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The Bouncy Dynamite rolling to a wall without losing speed.
Bouncy Dynamite is an opposite to Sticky Dynamite as it will bounce much more than ordinary Dynamite before it explodes, this may be used for fun or to increase the range by bouncing if wishing to explode targets further away. It also is slightly more battle-friendly than regular Dynamite, as its bouncing means it can more easily hit enemies off the ground, plus if it explodes in the air it will destroy less.
Bouncy Dynamite has the same explosive properties as Dynamite and can destroy Chests, it also has the same use time and distance able to throw not regarding extra bounces.
It seems that it can also roll indefinitely without losing speed until it explodes.