Ramset 25 Pack .22 Caliber 42CW Yellow Powder Fastener Load. Ramset powder loads provide you with the performance and power you need to penetrate hollow block and concrete. The .22 caliber fastener loads are color coded yellow and are power level 4. When beginning projects use lower level loads and move into higher load if fastener does not set completely. Fastener loads work with models 721, M70, RS22, HD22 and Hilt DXE37 and DXE72.