Heavy bolt lift, because of tight neck area? That could be why the heavy bolt lift. A very long time ago I develop a system on ranging my rifle before range finder were any good using a duplex scope. Set up deer sized targets at 300, 400, & 500 yards. I placed the scope on it's highest powder and studied how it looked in the scope. With that being done, I could instantly determine my range. I bench that 25/06 and shoot 300 to 500yds distances. Nothing special being done on the reloads. That maybe where I lost you at. They group at or just under 3" @ 500 yards (5 shots). Also at that time I didn't clean flash holes, weight brass. turn necks, Trim in case back .010". Nothing the same on lengths, no annealing, any anything except powder measurement being on. COAL was to manual spec. All the case work now is getting grouping under that. The only I times ran into heavy lift was either my cases were to long, or to much powder in the case. If the cases were hard close, then that a difference story. You are correct it the bullet doesn't drop into the case after it has been fired. The chamber is to tight. So trimming the neck thickness down is needed. From what I have read over the years, you shouldn't cut the thickness to under .012". The reason behind that is the necks are to thin and split quicker I guess. I have had that problem yet, so I don't really know. Now I have been able to set neck tension with bushing dies, and not used a mandrel to expand the necks. Being the necks have been cut for thickness and before ever being fired. Now I have just started to set neck tensions, and I am watching for spring back now. I am going to size some cases and not load to watch what happens to the neck over a few months to see if there any changes. I am having to step down 4 times to achieve my neck size. Now I didn't anneal any of them at that time. People are saying I should anneal in between the second and again after the finely step. That would be sizing a 5th time before fireforming the cases. I have about 500 cases so I can do some different things and see how the cases come out or last. So my cart is full for now, and my reloading gear is in Montana and I am in Mexico-North. (aka Calif) I don't know if that cleared up anything or not. So neck thinning doesn't have to happen in most rifles if shot are held under 500yds and your groups are good. So shooting @ 100yds and thinking you good for 500yds doesn't cut it. Everybody should shot the longer distances to be sure what that rifle is doing.