CHAMP198
A lot of what he is saying is correct. Not all ML's are alike some like this some like that.... Your gun will tell you what it likes and what it doesn't. If you are shootinga 100 grains and the groups on the other are what you are looking for - then shoot it. If you want to tighten up your groups you may need to move up and down in the powder range.
Reading your sabots can tell you a lot about your charge when you reach the max chrge area. If you look at the base of the sabot (the cup) and it is burnt, melted, severly distorted, you may be in the max area.
The most important thing is not to exceed the manufactures recommendation for the rifle that you are shooting.
Now that I have said groups are a function of the load - I will back trac and say there are a lot of things that can effect accuracy other than load.
Hope some of this helps....