I am new'er to rifle reloading. I've been at it a couple months now. I have this cheap 30-06 that shoots factory ammo below .75 inch consistently at 100 yards. Even the cheap Prvi stuff. My goal with reloading was to get it below .5 inch. I was getting frustrated with my reloading because I was averaging around 1.25 inch groups. I use good components; Lapua brass, Nosler Competition 168gr bullets and also Hornady Amax 178gr bullets, CCI primers, IMR4350 or IMR4064... I eventually talked myself into believing that my electronic digital scale must be junk so I purchased a standard RCBS balance beam style. It all checks out so that wasn't my problem. After some research I realize, Oh! It has to be my cheap Lee dies I'm using. I must have too much runout. My ammo is probably not concentric. Except it is... It's very concentric. I measured the mouths of full length resized never fired Lapua brass. The dial barely wiggles, not even a fraction of .001. All good with my full length resizing die. I measured the mouths of once fired brass that I collet neck sized. Again the dial barely wiggles. All good. I measured ammo with the bullets that I've seated with my Lee die. Once again, the dial barely wiggles. Probably 1/5th of .001. I wanted to make sure I was using the gauge correctly so I went and grabbed some old military surplus 7.62x54R and 303 British ammo that I have. I found out, yes, the gauge is definitely working. My results of my own reloaded ammo was just surprising to me. I was fully expecting to have quite a bit of runout for a couple reasons. 1) I've been told you should barely feel the expander ball in your full length resizing die. And if you do feel it grab too hard you should sand it down a tiny bit. Well, mine actually does grab hard when I'm full length resizing. Especially with the thicker Lapua brass. My Lee dies must be machined good because my concentricity measurements are showing it's not distorting anything in the case mouths. 2) I'm not using the Redding/Forster/Wilson high end reloading dies. ( I watched a video where a guy compared bullet seating runout using RCBS dies vs Redding bushing dies and the results were drastically different ). I'm curious if most of the reason I don't have concentricity problems is because I'm using the very stout Lee Classic Cast press. I would imagine there is no flex in this thing when I'm cam'ing up and down. Now I'm super anxious for my Hornady OAL gauge and comparators to come in the mail! I've tried different bullet seating depths but I think it's time I test using the method described in the Sticky.