Factory Ammo in an Ackley Improved Chamber

I know, reloaders claim they move the shoulder back and they can move the shoulder forward, I understand that sounds impressive but when forming, sizing and firing my shoulders do not move. I understand how difficult it must be to understand when I say the length of my case from the shoulder to the case head increases without moving the shoulder, added to that when I say the distance from the shoulder to the case head increases the case shortens from the end of the neck to the case head; point? I would suggest you measure the length of the case, there is no harm but I would suggest you try to figure why the case got shorter when forming and or firing.
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The case would get shorter if the chamber is larger in the forward area of the case body. Most cases are tapered from head to shoulder. Most improved cases have added volume by changing the taper of the body (straightening it) and the shoulder. As the brass swells to fill the chamber, the mouth is pulled rearward towards the head. Thus, the case is fatter after forming in the forward area of the body, and the shoulder goes from a 25 degree to 40 degree angle (kind of like a weatherby).

This is how I imagine what is going on.
 
The only necks I bother turning are on benchrest guns. I have never turned any Ackley necks. If you were going to do it, it would be after fire forming and after sizing. I prefer taking the expander button out of the die and then inside neck reaming, but to each his own.
 
The only necks I bother turning are on benchrest guns. I have never turned any Ackley necks
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I turn the necks on my F-Open LR rifle. This 6mm Ackley may become my F-open MR rifle if it shoots, so I will if that's the case.

I thought the best answer was to turn after fire forming, but wanted to ask.

Thanks
 
If it'll chamber as-made, I wouldn't neck-turn until after forming.

There isn't much point in cutting brass until you know what needs to be cut.
 
When to neck turn? How much trimming is required? And then: When?

Does anyone measure before and again after? I do. And then there is a technique that only works for me; I shoot a round and then take the next round to be fired and stick the bullet into the neck of the fired case. I have never had a 'fail to slide' in my life and I had no ideal everyone had a reason for this technique mot working. And when I have access to the chamber I use a dead end micrometer, it is so simple; find the neck, expand the micrometer, remove and measure like it was a transfer.

There is chamber casting, wouldn't you know it, no one would recognize my chamber casting.

F. Guffey
 
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