Mt Al,
You might try fireforming one of your cases that have the too tight necks. Use a forming load without a bullet, but with a granular filler (such as worn-out polishing media, grits, or with deference to sharps 45-90, cream of wheat) separated from the powder charge (a light charge of fast burning powder) with a quarter to half sheet of toilet paper tamped over the powder and the whole thing plugged with another wad of toilet paper. This will keep the necks squarer than expanding with a plug. If you find fireforming helps, fireform the rest of the cases. I just use an "M" die or 45 Colt expanding die with "shop made" plugs to bell or expand case necks that are long enough to square up. These die bodies are threaded 1/2"-20 and common bolts of that thread size are useful to make the plugs from. After a while a collection of different plugs will be accumulated for different uses. A lathe is a necessity of life, after all.
Mike
