What makes you think the headspacewas right to begin with? Is this a factory or aftermarket barrel and put on by whom? Are you completely sure that after sizing there is absolutely no lube left over on the cartridge. Did you induce a headspace problem by oversizing? Keeping in mind,I dont know your level of expertise. You should take one fired case and back off the full length sizer about a turn or so and size it and try it in your chamber to see if the bolt closes easy. Then when you get one to fit and close easy take another fired case and put it in the shellplate and bring the ram up till it just touches the case and back off the die to see how close the two are,you can measure with feeler gages from the top of the shell plate to the bottom of the die,check it with the first one and record the reading then when backing off with a fired case you measure where the ram comes into contact with the fired case and the ram is cammed over without sizing that case.This way you will see how much ram travel there is to actually size a case enough to fit your gun.You would be surprised at how many people read the die instructions that tell you to turn it down till it touches the top of the shellholder and lock the nut on the die.Sometimes it works ok and sometimes it is way the heck off. Tell us what equipment and bullets and powder,brass and primers you use.
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