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SigStroker
I bought both the 223 and 243 WSSM when they first came out in the Winchester.
The neck is 0.020 thick to handle the pressure using factory Winchester brass.
They also made the loaded rounds the same over all length to fit into the shorter actions so the 100 grain bullets are seated very deeply into the case. The 55 grain 223 and 100 grain 243 look the same in the picture.
If your a handload and don't mind turning necks you can order a reamer with 0.014 brass thickness in mind and extra freebore so you can seat the bullets in the proper location.
The downside to doing that is you then need a longer action.
You gain velocity with the longer freebore you gain brass life with the thinner neck and you can download the cartridge.
The thick neck works fine on fullhouse factory ammo but if you try and load it down it will collapse the neck shoulder area of the brass. A non max pressure load coupled with the extra thick brass doesn't let it seal tightly against the chamber and it collapses the brass trying to escape around it.
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