Lubricant is necessary when resizing brass, but oil is not the best choice, and I've never seen anything but grease in the grease grooves of cast bullets that weren't coated with a dry lubricant. If oil has any place its to lubricate the articulating joints of the press where grease cannot be easily applied. It is best to keep any oil away from primers as it will deactivate them in short order. If you damage a primer that you don't wish to reuse, then putting a drop of thin oil on the anvil will render it pretty much inert inert after a short period of time.
Imperial Sizing Wax is an excellent product for case lubrication prior to resizing, and Imperial Dry Neck lube is excellent for the inside of case mouths. It allows the expander ball to pass easily, but doesn't cause particles of powder to stick to it.
Thanks for tips. I have a Lee turret press that I want to use for rifle rounds and a Lee progressive press that I have already set up for 9mm pistol. I've cleaned a bunch of 9mm casings in a tumbler. Should I get some sizing wax before I run them? I only plan to make 25 rounds at the minimum load. I've never done this before and I want to keep all my fingers.
You don't need to, but spraying them with some lube will make the reloading effort on the press 5x easier and smoother.IF your 9mm reloading die set includes a carbide resizing die then you don't need to lube your cases at all.
A neat trick to remember when sizing cases is to take a pill bottle or the like and add a tablespoon of graphite and a tablespoon of small (#7 1/2 or so) shot to the bottle replace the lid and shake to mix. Then dip the case neck first into the bottle before resizing and then gently tap out the graphite and shot. This lubes the case inside and out but leaves only a thin dry residue of graphite, something gunpowder has in it any how so will not have ill effects on the powder.
DO NOT substitue graphite with molybednium disulphide (moly)
It can plate the case and cause excess pressure on the bolt face as the brass will get no traction on the chamber as it swells up when fired.
I think the reason the reloading companies recommend lanolin or veg based lube is because of pressure. Extreme pressure, like in your sizing die, can create detonation of the oil. The manufactures know what they are publishing. Spend the few bucks and buy case lube!
My apologies, autoignition is only a factor when making jacketed bullets, not resizing cases.



























