I'll start by saying that when it comes to rifles, I'm still a bit new to certain aspects. Messing with optics and sighting in rifles is something I have very little experience. It is something I'm trying to learn through various means. This week, I went to the range to adjust the sights on an M1 Garand. After doing some reading online, I read a few suggestions to take the rear sight back to null settings (no windage or elevation adjustments), then to start at 25 yards and see where you land, making adjustments as you go, then moving out to 100 yards once you get things dialed in at 25. I went out earlier this week to give this a try for the first time. Unfortunately I didn't realize until after I got there that I had forgotten my spotting scope, so I was going to have to stick to 25 yards for the day. I had previously shot the rifle off hand, but couldn't get a good feel for where the sights were set, so I just wanted to start from zero adjustments and go from there. My first shots were low and left, so I started dialing some elevation, a click at a time, as well as pulling in some windage adjustment. I was loading a single round at a time, fired from a rest. Ammo was a mix of older surplus and some newer manufacture PMC loaded for the M1. As I made the adjustments, I could see I was getting closer to the center mark. As I was running out of time, I moved to the outer bulleyes to put 2 rounds in each and make some additional adjustments. Overall, I could see an improvement in the sighting. In the photo below, target 1 shows the shots I fired as I did the initial adjustments. Then I moved in order to targets 2, 3, 4 and finally 5. I was pretty happy with #4 and on #5, both shots went about through the same hole, but were still a bit low and left. Part of this is probably me just getting used to the rifle, the sights and the trigger. I'm probably throwing this off just by my own lack of experience. But it's all part of learning. So, I think I need just a bit more elevation and windage and I should be about dead on. And that finally brings me to my big question - if I get this dead on at 25 yards, what further adjustment do I need to make to zero at 100 yards? The internet hasn't been particularly helpful here as some folks say zero at 25 is pretty much zero at 100, while others say that there needs to be some elevation adjustment. What do the good, much more experienced folks have to offer here? Do I need to make further adjustments for 100 yards once I nail down the 25 yard zero? What type of groups should I be expecting from the M1 typically when it is at zero? Again, I'm new to this, so please forgive the pleb questions Thanks folks!