Back in 2019, archaeologists excavating at Shrewsbury Castle discovered two military crossbow bolt heads. The heads came up in 12th/13th Century layers, and as such considering their size and weight (1/2" socket, 25g) it's pretty safe to assume they're crossbow bolt heads, not arrowheads.
Working alongside Dr Morn Capper from the excavation team, I've forged out a number of replica heads for the museum, alongside this film of the construction of the heads themselves.