Re: To lube or not when seating bullets
I don't lube case necks, but experience over that past week has made me wonder about that. My concern is not about lubrication between neck and projectile, but about bonding.
I have a bunch of .222 Rem ammo made up for my Granddaughter to use, but it really hasn't been performing that well, and I've acquired a Stag 5.56 Super Varminter that I'd like to get set up for her to use instead. I decided to repurpose the bullets and propellent from the .222 for use as load development test loads for the Stag. So I got out the collet bullet pulling setup and went to work.
About 20 rounds into the exrcise, I got brought up short. The bullets were suddenly acting like pulling teeth. With no warning, the pull force was several times harder than the ones at the start.
Without exception, the tougher ones had a band of brass colored discoloration around their circumference starting at the base. It varied in height and was usually uneven in height running around that circumference, reaching as much as 1/4 of the way up from the base to the ogive.
Also without exception, they were coming out of W-W cases, the others were R-P. I don't think the brand difference is important here, but the two types probabaly underwent different case cleaning/prep; and in any case, I'm not going to re-examine the archaeology of the processes involved. If we have an issue here, it's the future that counts.
I ran the bullets (about 60 of them) through the case polisher using red rouge treated walnut. They cleaned up, but the discoloration remains.
I don't think it's too hazardous a jump to conclude that for some reason, bimetalic corrosion has taken place, bonding the components and migrating brass over to the jackets. This is from ammo that is at most three to four months in existence.
I don't presume to understand it, but I do know I don't like it.
I want to add something to the process, but not as a lube. I want it to act as dielectric layer, interrupting the bonding process.
My first inkling says graphite, perhaps with some sort of agent that serves as plasticizer (wax, grease?). Ideally something a lot like rimfire bullet lube with graphite mixed in.
What I don't want is something that's going to interact with the propellent, altering it in some/any way.
I also think the coating should be applied to the bullet, not the neck interior, so powder granules don't clog in the case neck, and so lube buildup does not get pushed ahead of the bullet as it is seating.
My reason for posting this here is as a sanity check. Is this really too far 'round the bend; and if not, is any part of the reasoning truly sound?
Greg