Carpet - I don't think you understand what we are trying to tell you. The point is not to shoot 5 of one load then 5 of another, etc. But to shoot one round each at a different target then repeat.
Example: 1st shot load #1
2nd shot load #2
3rd shot load #3
4th shot load #4
5th shot load #1, then load #2, load #3, etc.
Actually, to really check the accuracy and remove the fouling variable is to do what the muzzleloaders do and that is to swap the bore between each shot. Of course black powder and substitutes leave a lot more residue behind than smokeless powder.