Ramset 100 Pack .22 Caliber Brown 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 brown and are power level 2. Use with low velocity tools and move to next power level if fastener does not set completely. Fastener loads work with models 721, 4170, M70, RS22, HD22 and Hilt DXE37 and DXE72.