I fired 6 rounds through the SR1911 and Ruger Blackhawk in 27 degree weather to find out how sensitive this ammunition is to cold weather. Part 2 will consist of firing the same loads with the same pistols in weather above 60 degree's. Stay Tuned for Part 2: SR1911 Ruger 10MM Unboxing http://www.dayattherange.com/?p=5850 SR1911 10MM Range Visit http://www.dayattherange.com/?p=5855 Ruger Blackhawk 10MM Stainless Unboxing http://www.dayattherange.com/?p=5904 Ruger Blackhawk 10MM Stainless RansomRest http://www.dayattherange.com/?p=5917 SR1911 Ruger 10MM Chronograph Results 180gr HSM Group Size = 1.8' at 25yds -- Pistol Rest Lowest = 1069 Highest = 1093 Average = 1078 Extreme Spread = 24 Standard Deviation = 9 SR1911 10MM Chronograph Results 200gr HSM Advertised Velocity = 1041 - 481 ft pounds. Lowest = 1015 Highest = 1053 Average = 1038 Extreme Spread = 40 Standard Deviation =14 Ruger Blackhawk Stainless 10MM Chronograph 180gr HSM Lowest = 1116 Highest = 1149 Average = 1132 Extreme Spread = 33 Standard Deviation = 12 Ruger Blackhawk Stainless 10MM Chronograph 200gr HSM Advertised Velocity = 1041 - 481 ft pounds. Group Size = 1.1' at 25yds -- Pistol Rest Lowest = 1070 Highest = 1109 Extreme Spread = 39 Standard Deviation = 13 The advertised velocity of the Bear Loads were pretty much the same as the results I achieved today. Which could lead one to believe that the cold had no effect at all on this ammunition, though I still plan to test these loads in warmer weather conditions.