"And is there any way not to mess with the neck? All i want to do is press the case some near the bottom. "
Yes there is: 6 x 45 mm small base sizer. BUT keep in mind you're chambering a live round in the sizer die. If it happens to ignite( by some super unlikely case), stuff is going to come apart in your face. I've tried it a few times but just can't feel good about putting myself in this situation.
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