I think Steve at Hammer Bullets suggests using Nosler load data because Hammer bullets show less pressure than conventional bullets, and the Nolser data tends to be a little on the hotter side and so fits well with this Hammer bullet characteristic.
@Ingwe asked me if I would start a thread detailing how we do load development, so here goes. With a rifle that is new to us the 1st thing we do is clean it until there is no copper from other