You didn't use the Audette method but now is a good time to use part of it. Take the 3 tightest groups that are in order. Reload those and see what happens. Also compare impact area. IE 46,47,48 hopefully all the impacts will be the same. Then if thats the case I'd take the middle charge as you have the most leeway in powder charge area which means you are in a sweet spot in the harmonics of the barrel. Which also tends to give leeway in temp and other variations.

The absolute WORST thing you can do is shoot 46,47,48 and pick 47 because its a 0.2 inch group while 46 and 48 are 1.0 inch or worse groups. That means that you are in a fluke spot. Even if you can repeat the accuracy of 47 a few times, what happens when the variables of powder charge and ambient conditions change? You will be changing your MV which will in turn mess with the accuracy part of it.

Finally speed is by far the last thing to worry about. 100 fps more or less will make way less impact on the end results than will be by going with the most accurate group.

Take this for what its worth to you. What its meant to me is that it is the best system to work with and that comes from running almost 8K rounds a year since 1990 and reloading for a few other shooters meaning I've been doing the same method and loading for up to 15K rounds a year on average until just last year.

Best, Jeff