I've used both the 1 series and the 5 series, and one of the slower pistol powders. 3N37. I like them. I had a temperature problems developing loads in California heat for hunting in Montana and Wyoming in winter, and decided to try the 5 series in 338 Win Mag and 338 Jamison, and N140 in 7-08. I found that N1 series was as stable temperature-wise as the N5 series. I like the powders, their biggest negative being price and availability.
