I used Speer 90 gn flat base, by the thousands, for decades in my 243s and always found IMR 4350 to give me very good velocities and superb accuracy. Then I got a deal on several thousand 80 gnrs and still found IMR 4350 to be the ticket both accuracy and velocity wise. As far as the actual loads go that is up to each individual rifle and I don't publish my loads. I use several different brands of brass but keep them all segregated, using mostly W-W and IVI now.