Decided to change my basic position and shoot off a closed hand knuckle rest. I put on a full shooting glove and switched to a knuckle rest w/ the back of the hand facing the target. This gives me a bit more elevation and I can take a stance that isn't so wide -- I don't have to push the rear foot way back to bring the natural aim point on target. But now I am shooting everything to the right.
I spent about an hour figuring out what I was doing wrong. Thinking about it carefully, without moving your forearm, shooting off the palm of the right hand (remember I am a lefty when shooting) with the rifle between thumb and forefinger brings the aim point not only lower, but also to the left, versus shooting off the top of the knuckles with the wrist straight. OK, I shifted my position a bit so my feet aimed a bit to the left to compensate, but no joy -- still drifting right with over half the shots, and struggling. Then I tried something that really helped. I will pass this on to other emerging target shooters. I have never read about this trick, bur for me, it helped me work it out.
I took a spool of stout cotton cord and stretched a straight line of cord from the floor under the target to where I was standing, took off my shoes and shot in socks. I started paying attention to exactly where my feet were positioned on that line -- I could feel where my rear foot was on the line without having to look down. When shooting with the rifle resting on the palm, my forward foot was angled slightly with my toes out toward the target (an open stance for a golfer). This also turns the right hip outward a bit, and brings the rest point of the right elbow on my iliac crest to the right -- so shooting off the palm, the rifle is on line. But off the knuckle rest, turning the right foot and hip out means with right forearm straight and relaxed, the point of rest tends to turn the right also. By closing my stance and making sure my right foot was exactly square to the cord and my left foot was centered on line, my right hip turns back in and my rest and natural point of aim are back on target. Who'd of thunk changing the forearm rest position requires changing the position of your feet? If that was in "The Ways of the Rifle" I must have missed it the first time through.
I read the tips about dry-fire practice -- but I never do it. If I am going to practice, I feel like a pellet needs to going down range with every trigger pull. But IMHO, if my body position is exactly right and solid, and relaxed, even when I "pull" a shot, it still ends up in the 9 ring, and more importantly, when I am shooting well, I can see the pellet hit the target. Maybe it would be different with a lighter rifle and heavier trigger pull. but kinda like Yogi Berra might say, body position is 90% of target shooting; the other half is the trigger pull.