MSHA - Code of Federal Regulations - 30 CFR 56.6304
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MSHA - Title 30 CFR
30 CFR § 56.6304
Primer protection.

(a) Tamping shall not be done directly on a primer.
(b) Rigid cartridges of explosives or blasting agents that are 4 inches (100 millimeters) in diameter or larger shall not be dropped on the primer except where the blasthole contains sufficient depth of water to protect the primer from impact. Slit packages of prill, water gel, or emulsions are not considered rigid cartridges and may be drop loaded.
[58 FR 31908, June 7, 1993; 58 FR 69596, Dec. 30, 1993]
NOTE: At 58 FR 69596, December 30, 1993, the effective date of §56.6304(b) is stayed until January 31, 1994.