RE: "Witness" Marks?
When hunting I load at the house with my range rod. I hunt my own property. Actually on a clean barrel loading is not all that hard because the projectile goes right to where it should. I find the witness mark more important on the range. As your range day wears on, that is when you will notice the importance of the witness mark. All of a sudden you start to note you are 1/4 inch or more off load but it seems set. That normally means that the barrel needs a good cleaning.
If I do get a shot out hunting, I then load with the hunting rod that came with the gun. I use no witness mark on my hunting rods.