I'm just the opposite of Breechplug. I hardly ever worry about getting the group centered on the bull to post a target. I usually have each gun sighted in for the hunting I've developed for that gun, and usually have them set for an inch or so high at 100 yards. So when I'm playing with loads that are different from that gun's hunting load the group is likely to be off of the bull a little. So long as it's on the paper so I can judge group size I'm happy.

Same thing when I'm searching for that hunting load. I don't worry much about where the group is on the target until I've picked the load I want to use. Then I do final sight adjustment.