I use precut/lubed, round patches.Center them as best as I can on the muzzle and set the RB and push it home..I can't see how the patch doesn't shift some as it is pushed down the barrel, so exact at the muzzle is good,,I guess..IMMHO.
From time to time ,I get the feeling we try to add more than is necessary and/or useful JMMHO
I shoot with a fella that uses a pressure gage to load,ever shot the same pressure when it is seated on the powder,powder measures to the exact and temperature,barrel heat/time in the sun is also figured in,,,he has fun and that is how he wants to do it,,good on him.Might be something in it,,I just missed it!!!!