For use in .44 Special, 44 Mag., 45 colt, 44/40 and .38/40 calibers. We have tested these in an 1873 Winchester with very good results. Noise, flash and smoke were extremely realistic and better yet, we had no problems in feeding through the magazine. No misfires! Extraction and ejection were both smooth. These blanks are injection molded plastic with a closed end and built in break away style that opens when fired. This eliminates the need for wadding – and no wadding means nothing leaving the barrel that might insure someone. These blanks are to be used once and then disposed of. Improved, non corrosive! As with any blank load, always use common sense and follow normal gun safety rules. UPS Ground only - US 48 only.