I've been loading 3.8 grians of titegroup under the aim 185. COL is 1.120. I use the Lee Factory crimp die as well. Before the 185 came out i was using the 180 TC. I have used both CCI and CCI Magnum primers. I tried taking it down to 3.5 grains but was not consistently putting up minor numbers. The first shot on a cold barrel always brought the average down too much. Hope this helps.