I use 44grs of IMR 4350 under the Accubond in my 257 Roberts. I get velocities of 2950ft/sec and .75" 3 shot groups. This is way over the max charge listed so be very careful and work your way up. I am using Winchester +p brass with no signs of excess pressure in my Ruger M77 mk2 rifle with a 22" barrel.

I called Nosler and they said to use data for the 115 ballistic tip as a starting point.

Good luck.

Mark