Got a quick tip for you that I don't think anyone uses...but it sure helps me.
Check the photo below.
What you are looking at is a target representing exactly what my rifle and load combination does downrange. Once I "pair-up" a rifle and a load, I take one target and shoot that target at all the distances available at my local range. As you can see my Rhino Arms rifle shoots rather well paired with Freedom Munitions 55Vmax Remanufactured ammo!
Now I have a visual sample of where I hit in relation to my aiming point. In this case the Burris AR-1X sports a 4.5 MOA center dot (with several horizontal marks at 400, 500 and 600 yards). Using just the center dot and holding ONLY in the center of the target at all distances (50, 100, 200 and 300 yards) I know where my bullet impacts in relation to that dot. Note that in the photo (kept in my phone for match day reference) the Dot is shown in increasing size as it does in relation to the target.
I have several of these targets on hand for different load and gun combinations. Not only are they good for match day memory lapses, they let me verify a current zero and/or re-zero after a scope swap.
There you have it: a simple tool that only takes about an hour or so to do.
Don't say I didn't tell you!
Yours in Sport