5whiskey, shoot at least 20 shots per test group with each sizing method else the results you get won't have any statistical significance. If you shoot several groups with the same ammo and they're not all the same size (within 10%), you've not shot enough rounds per group for them to be meaningful.
US Navy Distinguished Marksman Badge 153
Former US Navy & Palma Rifle Team Member
NRA High Power Master & Long Range High Master
NRA Smallbore Prone Master