Has anyone else noticed that RW's "Most Accurate Loads" all use the Winchester 209 primer? Is this a better primer for accuracy than the Federal 209A's? I've always shot the Federal's but I'm thinking for tighter groups, the Winchester may be the way to go. He's set some tough standards to make the "Most Accurate Load" chart and I'm wondering if this can better be met with the Winchester 209 primers? I guess I'll pick up a box and try them for myself. Has anyone else noticed a difference in group size by changing just the primer?