Or maybe not. But we are digressing from a chap who managed to separate a head from the case, in a die. Not sure that he has actually resolved that problem yet.
Seems that if you eff up you can truly stick a live cartridge into a barrel. Even more so than into a die. Oooh, it feels a bit tight, lean on the bolt handle, nope, not going in. Nor coming out.
Or let a semi-auto do it's worst.
Grease gun method ? Maybe watch Johnny's reloading bench. over a million people have watched just this vid.
Yeah, that method (grease) works too, if the barrel is threaded and you have (or can make) an endcap with a grease zerk.