I even tried mineral spirits, paint thinner, acetone to dissolve the coating with no luck. What ever that coating is wouldn't polish off. The fired cases my friend has/had, I tried to polish them in ground corn cob with a non ammonia polish for him to sell at gun shows he used to do. My thoughts is that maybe the case clear coating accumulates in the inside the firearms chamber or the inside of the resizing die. The picture you posted of the cartridges shows some of that clear coating worn off as so has the fired cases cases my friend still has, or had of which his fired cases were fired once and not reloaded. Either the coating is for cartridge feeding, or retention during the firing cycle. Is this coating supposed to to help with the function of the cartridge in the designed firearms ? I know that the FN 5seven, P90, and Ruger 57 are all three blow back in operation. I've have some 5.7x28 FN factory cartridges in my collection that friend gave me and notice a clear coating of some type on the cartridge cases. I first started using this polishing tool when I was loading Sierra factory moly coated bullets because even though I chamfered the inside edge of the case mouths, the unpolished chamfer was scraping off the moly coat as the bullets were be seated. Home Depot sells the hex shaft nut driver sockets separate so you won't have to purchase a whole set. A single pad of steel wool will provide enough small wads to do about 400-500 cases. After about ten or so cases, I'll pull out the steel wool and reorient it for a fresh spot. I glued a round piece of hook side Velcro into the bottom of the socket to hold the wad of steel wool to keep it from spinning in the socket well. I made one from a spare 1/2" hex shaft socket. After chamfering the inside of the case mouth, you can polish the chamfer inside edge with a cheap easy to make tool with a hex shaft nut driver socket with a wad of 0000 steel wool inserted into the socket well that is chucked into a drill and spun at a moderate speed. Sorry for the blurry shots and one of them being sideways but you can get the drift:Īlso. These are some terrible pictures but here is one that "plunked" and one that didn't. I also discovered that the collet style bullet puller is so much easier on these than the inertia whack-a-mole bullet puller, especially since it looks like I'm going to have a 40% fail rate. The problem seems to be that the flat based ones start pushing down on the neck of the brass before they start going into the neck which causes a mushroom effect with the thin brass. The information I have on loading these little bas - boogers says to use flat based bullets. I did not have good luck with them, after loading ten of them I checked them in the barrel and four of them would not plunk, so I gave up for the day after pulling them apart. When I ran out of those 40 grain bullets, I decided to load some of the 34 grain X-treme flat based hollow point bullets that I have had for about 20 years.
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