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Dangerous Substances (Explosives) Regulation 2004
234Bulling charges
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234 Bulling charges (1) This section applies to a blast hole in which a bulling charge has been fired. (2) The shot-firer must ensure that the blast hole is not reloaded until— (a) the resulting chamber has been filled with water; or (b) the hole has been left to cool to a safe temperature over a sufficient period, which must be for at least 1 hour. Note Bulling is also known as chambering and springing.