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RCBS Case Slick and controlling neck growth in bottleneck rounds

2952 Views 3 Replies 4 Participants Last post by  Lopper
I was talking w/ a local gunsmith who was working on one of my shotguns and the conversation turned to reloading, of which he does a lot.

I asked him if he knew about the RCBS X-Die, which will control the growth of the neck in a bottleneck round like a .223, and he said no--but that he uses RCBS Case Slick instead.

He sprays it on the outside of the cases as they sit on a cookie sheet, and ensures he gets a bit inside the necks. Result? No growth!

Well. Sounds easier than the X-Die, so I bought some. Tried it out, and all I can say is, holy moly.

I sized a hundred cases using the Case Slick, and virtually none grew in length. There was no shoulder denting, and the effort required to pull the case neck expander ball through the neck was minimal.

I ran them through a tumbler to remove the lube, though apparently it is harmless to primer and powder. I like to do that regardless.

Anyway, if you want to experiment, get some of this stuff and try it. I'm going to keep using it. Sure beats trimming, deburring, and chamfering.
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Good to know, I've been using it anyway because it was how I was taught to reload, but good to know it controls expansion. I have noticed That I have only ever had to trim after the first firing of any brass......Still check length everytime though just in case.
It's long been std reloading practice to lube the inside of the case necks &/or even use a carbide button to ease the force needed to run the button thru the case. THis is all nice, but it does NOT prevent case stretching. That is as much a proces of sizing as brass flow during repeated firings. Some cases/cartridges just stretch more than others & full power loads will show more stretch/growth than low power loads. I find I can go 3-4 firings before having to trim most of my rifle cases. Keep in mind, many gunsmiths know little to nothing about reloading or even ballistics.
when I was reloading a lot of .308s for NRA High rifle matches in late 70s someone said to brush a small amount of dry Moly lube inside the case mouths to slow stretching and it worked very well and got lots more loads per case. I still do this on bottle neck cases
during matches we used once fired lake city brass and the rest for practice. of course this was long before internet
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