Jason,
You have stumbled into the black art to shotgun patterning, it will tell you a lot about your gun.
You will get information about.
• The point of aim of you gun.
• The amount of recoil for different loads.
• How the various brands of ammo or various reloads respond to your choke
• Holes in your pattern.
• Dirty barrels, especially the effect of fowling around the choke tubes or the changes due to Black powder fowling.
• How changing reloading component can change all of the above.
As mentioned you will not get a definitive answer as to which load will always gives the best and most consistent patterns but you will learn which combinations your gun simply does not like.
Unfortunately “always” and “never” do not exist in the shotgun world but therein lies the challenge.
Good luck,
