Thread: Head Space Struggles with the 6.5x55.

Yes there are some here looking to solve a problem that doesn't exist. All brass and chambers have sizing variations so the solution is to deal with what you have each time in isolation.
The Lee collet die (crimping the neck onto a mandrel) will deal with most variances in neck wall thickness, but can leave a bit to be desired on thin necks and large chambers in that in will leave ridges as it tries to reduce the diameter. This can be overcome to some extent by first reducing the neck in a Full length sizing die and then using the collet to true it up and make the inside uniform.
Regarding the headspace....this is also variable in all chambers, and the die needs to be adjusted to suit. It is best as @T.FOYE has done....reduce the die length to allow the longer chamber types to be re-sized, and then let the die "float" in the thread for all the different brass. Mark your die for each chamber and re-size maybe 1/4 turn up for the first one then measure the brass and fit in the chamber and then reduce the length until it reaches the desired length. Back off for the next, and measure again and re-size until the correct measurement and fit are achieved. Annealed brass will usually be pretty consistent with the setting of the die being near the same each time, but un-annealed brass will be quite inconsistent in the setting depth.