I've just gotten a Ruger #1 375 and want to develop a practice load. I've looked in Lyman manual and found light loads (13-18 grains) of Unique. I have Unique on hand and have loaded some 16 grain loads but have not range tested yet. Anybody have experience with Unique loads in large cases such as 375? Manual said to use without a filler. I've seen data for XMP-5744 which looks good, but haven't found this powder yet in local stores. Your thoughts are appreciated.