versus a spotlessly clean case....?
(...and whether it really matters?)
It goes back to "only me", I do not want anything between the case and chamber but air, the air between the case and chamber (for only me) must be clean air. And then there is the matter of how much air; I choose not to use a lot of air, I do not want to risk blowing my hat off when the case expands 'rapidly'. And then there is all that case movement, I am the fan of cutting down on all that case travel. Dirt, grit and grime can be abrasive and most of that foreign matter is abrasive.
Foreign matter introduces another problem, the case is embeddable, I choose not to embed my cases with foreign matter, I choose to use clean air between the case and chamber.
There was a 60+ page thread on a bench rester forum, I was so proud of myself; I did not get involved. It started out with bench resters that could not form cases, instead of forming cases they greased their cases, chambered them and pulled the trigger; it was one of those 'Wall-aw' moments as in; "that is all your 'gotta' do. It was as thought they thought they discovered something new.
And then? the forum found 'grease your cases' is a trigger phrased for one member; he went off on everyone. Members had to agree with him, meaning they were not allowed to disagree.
In the big inning there was an offending bullet, I have called the offending bullets 'streakers' because? They streaked the barrel as they pass through the barrel. 100 years ago cleaning the streaks was not easy, shooters found to reduce the streaking they could lube the bullet, and then? They got carless, and then came the Japanese, they had machineguns that would not operate without greasing there ammo.
Things rocked along and shooters were cautioned about streak-er ammo, the last advise I have found was in 1954. There was noting about the miracle of fire forming by packing the chamber with grease. Cleaning the streaks could not be done with know remedies, the 1954 article had to do with cleaning barrels after shooting streakers. I have a few rounds from the old days and I have streaker ammo that was loaded before 1940. I have it, I do not shoot it and I do not greases my bullets. I choose not to have anything between the case and chamber but air; clean air and I choose not to have a lot of air between the case and chamber.
F. Guffey