Use a flashlight and look into the bottom of the cases and verify that there is a single flash hole (two small hole is Berdan primed, and your equipment won't work on it.)
Remove the decapping pin and rod assembly from your sizing die. Lube up a couple of cases, and size them to get a feel for what the sizing process feels like (ideally, it should be a single smooth stroke; not grabby or jumpy, which would indicate insufficient lube.) It'll also remove some of the friction from the next step.
Reinstall the decapping rod, less the pin, and screw it well up inside the die. Size a case, and leave the handle down (case fully into the die.) Now screw the decapping rod down until it stops (hitting something solid.) Measure from the top of the decapping rod to the top of the die body. Lower the case, and do what you need to do to reinstall the decapping pin. Reset the decapping rod to the height you measured, and back it off about a full turn or two (the collar will be a bit lower due to the pin.) Lock it in place, and try sizing the case again. You should be decapping the case.
That should work, unless your decapping rod is bent or your case's flash holes are way off center. If it's set up correctly, the decapping pins should extend below the bottom of the die by 1/4 to 3/8 inch or so (actual length doesn't matter much.)
Good luck
Remove the decapping pin and rod assembly from your sizing die. Lube up a couple of cases, and size them to get a feel for what the sizing process feels like (ideally, it should be a single smooth stroke; not grabby or jumpy, which would indicate insufficient lube.) It'll also remove some of the friction from the next step.
Reinstall the decapping rod, less the pin, and screw it well up inside the die. Size a case, and leave the handle down (case fully into the die.) Now screw the decapping rod down until it stops (hitting something solid.) Measure from the top of the decapping rod to the top of the die body. Lower the case, and do what you need to do to reinstall the decapping pin. Reset the decapping rod to the height you measured, and back it off about a full turn or two (the collar will be a bit lower due to the pin.) Lock it in place, and try sizing the case again. You should be decapping the case.
That should work, unless your decapping rod is bent or your case's flash holes are way off center. If it's set up correctly, the decapping pins should extend below the bottom of the die by 1/4 to 3/8 inch or so (actual length doesn't matter much.)
Good luck

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