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strange sizing question

Yesterday I went to the range and shot a lot of 223 I loaded on my new 650 press. The ammo shot very well and was more accurate than I expected. ( consistant sub moa shot groups) This was the first crimped ammo that I have ran through my AR15 it worked great. This batch of ammo was also previously sized on the same press

Now the weird stuff comes. when I sized and deprimed the brass the neck wasn't tight enough to hold a bullet. I never changed the adjustment of my sizer die and the last batch of brass I sized came out correct. The only difference that I am aware of is this batch of brass has been crimped with the standard dillon crimp die. when I checked, the size/deprime die was snug to the tool head and not loose.

Please advise.

Was the 223 brass you initially loaded new, or fired? Does the size die contact the top of the shellplate when the handle is pulled down completely?

The brass had been fired before. I will have to check to see if the sizing die contacts the top of the shell  plate when I get home from work.

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