I believe I would go with the 46.2. The method as I understand it is to narrow down a charge that has larger window of accuracy to either side of the given charge to allow for subtle changes in temperature etc that would otherwise swing accuracy greatly. at 46.2 you have such from what I can see. With all the charges hovering around MOA, if this were my rifle I would call it good. You may tighten that up even more if you have not yet tweaked in seating depths.
Of course, If I am off base in my understanding of OCW, then the above is useless.
__________________ “When a long train of abuses and usurpations, pursuing invariably the same object evinces a design to reduce them under absolute despotism, it is their right, it is their duty to throw off such governments. …” Jefferson
I would not use any increment smaller than 1/2 grain. Too many shots from adjacent 1/10th grain groups will over lap each other. It even sometimes happens with 1/2 grain increments, especially if each load's accuracy ain't all that great. And many loads with a 3/10ths grain spread in charge weight will shoot no worse than 1/2 MOA at 600 yards; 1/3 MOA at 300 and 1/4 MOA at 200.