With the 6BR I see nodes in my ladder about every 1.4-1.6 gr of powder. You have two sets at the upper end with little vertical. I would want to give up that much velocity. I typically try to do a ladder with 0.2 gr increments with a 6BR case capacity and 0.3 gr increment with the 260/308 size case. With 0.5 gr steps I would be afraid I was jumping over a node. Just my 2 cents. Tim