You mean the difference in powder weight from the 338-06 and the 338Win mag for a 200 gr bullets. Man thats like a 5 to 10 gr difference max. I am not sure you realize how big 5 to 10 gr is? In other words, there is 7000gr in a pound. If you can tell the difference in 5 to 10 gr increase with recoil you have the most sensitive shoulder in the world. And should be put in one of those Ripley places. Man, I am not trying to dog you at all. I just think your a tad confused about a few things. I have seen exact rifles/scope combos that differ in wieght by an ounce or two. You know how many grains that is.