Simpson Strong-Tie .27 Caliber Green Powder Load (100-Count), DomesticSimpson Strong Tie offers a full range of direct fastening systems designed to provide rugged reliability while keeping the job moving as fast as possible. They are also tested in the field to meet the most demanding needs of the professional. Our complete line of fasteners is extensively tested to ensure quality and performance. P27SL 0. 27 caliber single shot loads are compatible with all Simpson Strong Tie 0. 27 caliber tools and other common 0. 27