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Accurifle
Reply with quote  #1 
Hi, I am at a case prep status for my new 22BR project.
After 100 run of 6BR cases through FL die, I found three of them had neck split. This is my first wildcat and don't know this is general or not. Of course I have read 22BR guide in 6BR.com and chamfer the outside of the neck and lubed in & outside before the squeeze. Oh, the cases are from Lapua.

In addition, I also found the case mouth seems like it has crashed, it is deformed slightly. The diagram says case length of 6BR is 1.55 and 22BR is 1.52. Should I trim them?

Please let me know what you know.

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Mikem
Reply with quote  #2 
You should trim them first, to make sure there short enough to allow them to grow a little when sized down to 22BR. Otherwise the necks may crush. And then you may need to trim them again to the correct length after sizing or fire forming.
Do you plan to full length size after every firing, or just neck size?
Normally neck splits happen on older harder brass, how many times has it been fired? If allot, you will either have to except a few splits, or anneal the brass first.
What are you lubing the case necks with? You might try a light cote of sizing wax, It might help.
Mike.
Accurifle
Reply with quote  #3 
Mike, thank you for the info.
Believe or not, these cases are just out of the box of the manufacturer, unfired brand new.

I used common machine oil on inside with Qtips and imperial wax on outside with fingers.

I will trim them soon.
anyrange
Reply with quote  #4 
Accurifle
I did 200 Lapua cases the same way you did couple of years ago. I did not have any problems, I think you just happen to get three bad cases that had neck issues before you resixed them. It happens.
What are specifications on your 22 BR reamer. I ordered mine with .248 neck, Zero Freebore, and 1.570 for 1.560 case length.
No trim length.
If you have to turn the necks, do it first. The 6BR neck shoulder will move up into the shoulder when necked down to 22BR.


NorCalMikie
Reply with quote  #5 
Use the Imperial, inside and outside! Clean it off with brake parts cleaner, paint thinner, etc. Try sizing that way and see if it makes any difference in split necks. Never had one on new or fired brass while sizing to 22 BR.

You need to know your "actual chamber length". That will tell you when you cases need to be trimmed. Once you know that, you can set your case OAL to where "you" want it.
Accurifle
Reply with quote  #6 
The barrel is Border and the reamer is their own. I only checked their reamer is .254, no turn neck because 22BR info in the site did not mention the case length. I should have confirmed the diagrams first.
The form die is a Redding full length standard one. Don't know if it has a ceiling? to which the case crashes.

I will turn some cases and see what happens.
Thank you anyrange and NorCalMikie!
NorCalMikie
Reply with quote  #7 
When I mentioned knowing your "actual" chamber length, this is what I use.
When you know the measurements, you can set the OAL of your cases to the length you want and you'll know they are close to needing to be trimmed. If you set the headspace on the tight side, you will be able to go a long time before you need to trim.
Example: I've got 2 22BRs and a 6 BR. The chamber length (actual) on the 22 BR chambers is 1.584 and the 6 BR is 1.580 so if you're trimming to say 1.560 max, you've still got a way to go before you get neck interference. And that measurement won't change. And if you neck size only, (bushing) your brass won't grow like with full length sizing. Maybe 10 firings with no brass length change. A body die once in a while if the brass starts getting tight in the chamber.
And I use a Redding full length in 22 BR to neck down my brass.
Neck size with a Forster Bushing Bump Die and no shoulder bump. You don't need to know the reamer specs if you know the actual chamber length. Write it down so you won't forget, like me.

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Accurifle
Reply with quote  #8 
Great advice! Thank you Mikie
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