RE: Accurate 257 Roberts load with 110 Accubond needed.
I emailed Nosler and they told me to look at the text of the Nosler book for the powder they use in their custom ammunition.The booksaid to look no further then IMR4350 for accuracy. They also told me to use the same data for the 110gr Accubond as the 115gr ballistic tips. I worked up a load using 41gr of IMR4350 using Remington large rifle primers, Winchester +P brass. I do not have avelosity, but I was able to cover a 4 shot group with a penny. I know that it sounds hard to believe, but I will take a picture of the target and post it later.
I should say that they were loaded to 2.900" and this was shot in a Ruger M77mkII
Good luck and good shooting.
Mark Z.