Crossbows and bolts are found in bandit loot, but this is uncommon.These enemies drop up to 15 Steel or Dwarven bolts, but have an infinite supply like all archers unless you disable that through Skyrim.ini or another mod. The enhanced variants and exploding bolts are still a Dawnguard specialty*. Steel appears starting at level 6 and Dwarven starts at level 19, but with only a 1/6 chance.