Wapiti wrote:Mate I'm not trying to win an argument, just make myself look like a d*ckhead trying to avoid someone wrecking their gun.
It takes but the thinnest oil film to hydraulic the bore. Problem is that it builds up as the projectile accellerates, then at some point, any point, it cannot continue to do so and displaces under the bullet as it accelerates over it, bulging the barrel.
A lot of oil will/may internally change the bore dimensions more than a thin film, but the thin film builds as the projectile travels.
From a metals engineering perspective in tight-tolerance machinery, it's well known.
You don't get more of an interference fit than a projectile screaming down a bore with 50-65,000 PSI behind it in a centrefire cartridge. And you will NEVER measure the amount of metal displacement you may have already done if it's so slight you can't see it.
I'd suggest, just as a tip to others reading this, that you do not skip an essential step such as drying your bore before shooting. It is definitely not a waste of time.
Although not quite a myth this business about removing every last skerrick of lubricant, grease or any cleaning solution from the barrel has had long legs and seems to be perpetuated by people who seem to have a need to be seen as a 'holier than thou' guru on these matters.
The myth emanates from the practice of military arsenals filling the barrels and any other surface prone to corrosion with grease or in the US cosmoline in anticipation of storage for possibly long terms in a sub-optimal environment.
With time those greases and especially cosmoline had a tendency to dry out and harden.
Any attempt to fire a round in a barrel containing even soft grease would be very likely to result at the very least in a barrel bulge due to the mass of the grease filling the barrel, With dry grease or hardened cosmoline the consequences could be far worse or even fatal, if not to the firer then to the firearm.
A thin residual film of oil will not be a source of problems.
I routinely push a tightly fitting patch, only just moist with a light oil such as Inox, through my chrome moly barrels so as to remove the last trace of solvent in preparation for storage and I don't bother with another clean patch before shooting. With stainless barrels I do the same but with 3 in 1 silicon spray.