longgonedaddy--Here's what may be happening at 25 yards. It's all mental, at least it is for me. At 10 yards, the gun appears to be pretty steady, so I don't force any shots. At 25, the wobble looks to be greater, so I sometimes tend to try to make the gun go off when the sight alignment is perfect. In other words, I jerk the trigger. At 50, it can get even more difficult to settle down and accept the sight movement but still think about a smooth trigger pull instead of timing or forcing the shot.
Here is something to try. Put a blank target, like a sheet of letter sized paper, up at 10 yards and just fire a few shots in to the center. Then, do it again at 25 yards. You might be surprised at how good the group is at 25. The reason? with no reference point to aim at, you can just pull the trigger smoothly, even if the gun is moving around some. I've done this several times with good results, and it showed me that the reason the group grew way larger than it should have was that I was timing or forcing the shots when I had a small target to try to line up with the sights.
You might try the blank target and see what you think.
Joe