You're looking for a mid-range burn speed that's leaning just a little bit toward the slow side without getting to be a full magnum powder. This is one of the most heavily stocked areas of rifle powder options with literally dozens of great options. Assuming a 24" barrel and velocity being your goal your best results will be along the lines of: reloader 17, H414, Superformance, Varget, H4895, IMR 4895, Hybrid 100v, BL-C2, 4000-MR, and similar powders that are at home in overbore cases with bullets in the middle range of weight for caliber. Any of those should turn in high 3200's to mid 3300's easily. I prefer ball powders like H414 & BL-C2 for ease of metering. BL-C2 also smells great to me when it's burned.