Re: speed vs accuracy
Not a real answer to your question. But here's something to think about. The most accurate load is seldom the fastest load.
I have seperate loads for 0 to 300 yards. Then different powder and bullets for 300 to 1K.
Decide what you want to do with the round, whether it's punching paper, ringing steel or hunting. Then hunting groundhogs or hunting grizzely bear or moose. Very seldom (read that almost NEVER) can you get1 bullet or 1 load for everything.
I generally will use the lower power load if the accuracy is the same. It's easier on the rifle, my shoulder and the brass. Everything lasts longer.