I have read and listened to a lot regarding tuning your loads using the Node method and wave theory. I'm not disputing any of these ideas and they do seem to be the most prevalent among long range competitors. However, I have a question that perhaps some of the engineers on here might be able to better explain. All of these node and wave methods, are based on pressure curves and bullet time inside the barrel. That part makes easy to understand sense to me. However, even with powders such as Varget, which are supposed to be temperature stable, there is about a 30-40 fps difference in muzzle velocity from a 45F day to a 85F day. That tells me that the bullet time in barrel and the pressure curve has also changed a great deal as those ambient temperatures change. Its also the case that during a string, our barrels get very hot and the shots tend to move more vertical as the barrel heats up, so again the pressures and bullet time in the barrel is changing. But I don't know of anyone that has several different loads developed using the nodes method, for temperature changes of say 10F increments. I have not found a significant difference in accuracy as a result of these temperature changes, using the same load, although there is certainly a difference in vertical sight adjustment at longer ranges. Can someone explain how the node and/or wave method can be valid when taking into consideration these ambient changes that don't seem to affect the accuracy of the developed load?