I got a chance to test some loads today. This is continued from my last thread 358429. I tried 25 yd shooting with my 6" GP100. My loads are 3.5, 3.7, 3.9, 4.1, and 4.3 grains of TG, Federal 100 primers, and GT bullets 175 gr SWC cast at 2-2-96. [BHN 12] The bullets are loaded in 357 mag brass with an OAL of 1.635". The revolver was shot with my wrist on sandbags and no part of the gun touching anything. The 3.5 load shot a pattern not a group approx. 7-8". Next the 3.7 and 3.9 gr loads were not much better coming in about 4"-5". When I tried the 4.1 gr load it shot 1-1 1/4". The last load of 4.3 gr was again approx. 5" grouping. After those I fired my control load of 3.5 gr TG, same primer, and a Missouri Bullet 180 Pugnose powder coated with a 18 BHN. These bullets averaged 1-1 1/4". The results are strange to me. I don't understand how the groups were so bad until the 4.1 gr load and after I exceeded this load with the 4.3 gr load it was back to shooting so bad. There was no gradual curve to the test. Four of the loads shot bad and only one shot really well. The reason I shot the 180 gr bullets was to make sure it wasn't my shooting. In the past I have shot RimRock 170 Keith bullet [BHN 15] loaded at this same length with great results but, I ran them a lot faster and they shot very well. I have also loaded them with A2400 and an OAL 1.553" at 1395 fps. and they were accurate. I will try the 4.1 gr load again and also 4.5 and 4.7 gr of TG. The weather here during my shooting was 36 degrees with light rain and snow mixed. Does this small test match any other peoples?