hiya,
cheers for all the info!!!

i didnt realise/think about the neck bit becoming tight and crimping a round!

so i have got my trimmer (lee thing with a little metal rod) and knocked them all back some took a bit off and others didnt i have and chamfered and de bured these now.

so when you do a full length sizing all this does is neck size and knock the shoulders back?? becuase i thought the shoulders wouldnt beable to increase as stuck in chamber and no where to go kind of like fireforming