I was tinkering yesterday with 357 158 grain jacketed data from sierra and found what appears to be a humdinger of a load with Unique Winchester standard small pistol primer, for the 358429 loaded out to 1.650. It is actually dropping at 158-159 grains from this alloy. The range for the 158 grain jacketed at an oal of 1.585 ran from 7.0 ish up through 8.3 of unique. I started at 7.0 which was erratic. 7.5 was a bit better and gave me 1108-1165. Having zero pressure signs I got very steady and accurate with 8.0 grains of unique right from 1215-1225 and a steady 1420 from the 20 inch '92. This would be a great utility field load from 357 brass from this alloy.... I've not loaded anymore, yet. Given the extra case capacity viz a vis the jacketed bullet and a cast bullet weighing the same as jacketed, should I be concerned about undue wear on the GP 100 using Unique to get highmiddlin' velocity? I have 7 lbs and would love to use this load extensively.
Jason