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Preacher
Reply with quote  #9 
Those necks look like they have been expanded to me...
No need to trim until they have been fired at least once...
Not so sure about using motor oil for a lube, when Imperial die wax works so good and sure is cheap enough...
Accurifle
Reply with quote  #10 
Yeah, I thought the same. I have never imagined a case split happnes in necking down.

As to lube, wax is hard when it's cool and difficult to apply on inside the neck. So I used machine oil with Q-tips. Could you tell me how you do that?
NorCalMikie
Reply with quote  #11 
Roll a Q Tip in the wax. Do the inside of 5 or 6 cases at a time.
Use some wax on your fingers to do the outside of the neck and upper body/shoulder area. Too much and you get dents in the shoulders but they'll blow out as they get fired. Doesn't take much on the outside. Trial and error.
Accurifle
Reply with quote  #12 
Thanks a million! Will try.
jb
Reply with quote  #13 
having just done 3000 20vt from 223 lc. i learned a lot mainly what not to do. i found a small dent inword on the case mouth would some times cause an inward crease looking like a crack. any out of round mouths start over exspanding ball by hand to true up.
NorCalMikie
Reply with quote  #14 
Might be that going from .223 down to 20 is a little tougher than from 6MM to .224. The smaller the caliber gets might have a bigger effect on the necks? Were you using new brass?
I might have split one neck out of 1000 or so.
After my brass is fire formed I only neck (bushing) size with very few problems. You could expect problems if the brass has been fired a bunch.
Mikem
Reply with quote  #15 
One think that didn't get mentioned is, when making your 22br cases, its a good idea to chamfer the outside of the neck mouth, so it starts in the 22 cal neck bushing or die easily. This may reduce the number of cracked necks.
I also spin the case mouth down on a green 3-M scrub pad after chamfering, this smooths things out, and removes any burs.
I also use Imperial wax as the lube, both on the outside and inside the neck,if your die has a mandrel to size the neck.
If its just a outside bushing, there's no need to lube the inside of the neck.
Just a little wax on a Q-Tip, and its easy to remove with a 22 bore mop and a bit of lacquer thinner, or brake cleaner, as Mikie said.
And I have never split a case neck, knock on wood.
Mike.
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