Years ago I reloaded .357 and .44 with a Lee progressive 1000. I quit loading for years but now got back in, buying a Lee Load master in .223. To be honest I've been having problems, First I bought 1000 rounds of once used brass cleaned and de primed. I'm guessing the brass was sized as well. IN setting the press up I can load one round at a time but if I try to use it in the progressive mode things go bad. One problem in particular is when I go to seat a bullet. Some of the brass allows the bullet to "fall" all the way down into the case. I have tried adjusting the height on my sizing die to no avail. Any help?