These were my first reloads for the 366 Wagner. Looks like anywhere from 53 to 55 grains of IMR 4895 will do the job with the 386 gr. Hornady. I've got some 232gr Norma Vulcan, and some 285gr Oryx coming in to play with, and the local store has some Nosler Interbonds, but I don't think I'm going to find anything better hat what I've got now.
Rifle & scope weigh 7 1/2 pounds, with only the original plastic buttplate, and is leaving bruises on my scrawny carcass. Trigger pull is over 5 pounds, I need to work on that. Have a spare Husqvarna adjustable trigger that might go on it. Over all, pretty happy with the results so far.