Rodney, anytime you seek pistol shooting advice it helps a pistol instructor, like me, to know whether you are right or left handed; as well as whether you were firing that revolver in single, or double action mode. If — if — I were to guess by your 10 yard targets I'd say that you were firing in single action; and, statistically, you're probably right-handed. (How am I doing?)
I'll accept that the factory sights were, somewhat off, for that Remington '
Thunderbolt' ammo you were using; but I have a suspicion that your final adjustments were made: not for the gun, not for the ammunition, but for YOU. I'm going to guess that you're applying too much hand pressure to the bottom of the revolver's backstrap, too.
For well-controlled and accurate single-acton revolver shooting you want less, rather than more, of your trigger finger's pad (in front of the distal joint) to be in contact with the trigger's face; and for well-controlled and accurate double-action revolver shooting you want your trigger finger's pad to be, more or less, '
wrapped' around and (almost) up against the distal joint.
Your targets are interesting. Why? Because most new (revolver) shooters tend to drop their shots; you, however, are throwing most of your shots high and to the right. Your last target is particularly revealing! You were fatigued and appear to have stopped adjusting the sights; so I'm able to tell a little bit more about your style.
When you adjust pistol sights the best tool to use is either a mechanical '
Ransom Rest', or '
Caldwell Pistolero'. Suffice it to say that most ranges do not offer this type of equipment; so you've got to work '
freehand'. What I do is to roll up an old towel on top of my range bag and press the pistol's frame and rear part of the barrel into it. This saves me a lot of: time, ammunition, and guesswork.
The only way to analyze a group that's been shot freehand is to find the center of a good sized group, and guesstimate it from there. My best guesses for your groups — which you fired at different times during the
same range session — are stated above; and, after 40 + years of doing things like this, I'd say that some of the adjustments you've made were more for you than they were for the gun; and, after further more solidly supported test firing, you might want to back some of those adjustments off, and work more on how you are actually gripping the gun.
Finally, a few words about how to correctly adjust your pistol’s sights:
The cardinal rule is to move the rear sight in the direction that you want the point-of-impact to go. If you want to move the POI down then lower the rear sight by screwing it down in a clockwise direction.
If you want to move the POI to the left then move the rear sight to the left by screwing it outward in a counterclockwise direction.