Armory Sponsor
Posted: 4/7/2009 5:25:38 PM EDT
|
Hi,
I have been reloeading for about two year now and have encountered this one problem for the 1st time. After resizing and cleaning, the neck of the cases SHRINK! What is going on here? I am using an RCBS Liquid case tumbler. I switched over from the corn media one to a liquid. Has anyone noticed this problem with the liquid case tumblers? For the Dry media tumbler, I usually resize and decap then clean it. For the liquid, do I have to clean then resize / decap? |
|
I doubt that your choice of cleaning method has anything to do with it.
Actually...........who cares what your case's OAL was BEFORE re-sizing. ______________________ Clean your cases. You lube the case body and that includes the inside of the necks. You run it through your re-size/de-cap die. You check your work with a gauge. Assuming it's correct, it's on to the next step. So next........measure for OAL to see if it needs a trim or not. IF it's "on the money," do nothing. IF it's long, you trim. IF it's a bit short of your trim length, you don't. *IF it's way too short........maybe, you want to put it aside for recycling (or maybe for plinker use). _______________________ But, the truth is.............some people will measure their brass case length, prior to running it through their re-size die. So, maybe the case length will actually lenghten after re-sizing. Humm.........maybe your expander button dragged on the neck and pulled it forward. Yes, it happens. Or........... Maybe the case length will shorten after resizing. Well, your case was resized and the shoulder was pushed back.........RIGHT. 
Aloha, Mark PS........*Some very short case lengths have been reported from a certain manufacturer, that had been measured after it's initial firing. I suspect, that it was short from the factory. |
|
Quoted:
Hi, I have been reloading for about two year now and have encountered this one problem for the 1st time. After resizing and cleaning, the neck of the cases SHRINK! What is going on here? I am using an RCBS Liquid case tumbler. I switched over from the corn media one to a liquid. Has anyone noticed this problem with the liquid case tumblers? For the Dry media tumbler, I usually resize and decap then clean it. For the liquid, do I have to clean then resize / decap? Maybe I don't understand your question, but if you sized the case the neck was sized down. This is what you want to happen. The reason you want to clean cases is to remove the grit on the brass so it doesn't scratch the sizing die. Once a sizing die is scratched, every case will be scratched that is run through it. So whatever you method, clean those cases before sizing. My method, tumble/clean cases (dry) in walnut with a brass polish. Lube and size. Tumble the lube off (dry) in plain corncob. |
|
Sorry for being unclear, but the neck shrinks AFTER its sized. I cant understand it. When I try to load, the bullet will crush the case downward. In order for me to reload, it needs to be resized AGAIN (a 2nd time). I have no clue what is going on.
Could it be a chemical reaction between the RCBS Liquid Case cleaner and the RCBS liquid lube? |
|
Make some measurements of the case neck outer diameter after firing, after sizing and after cleaning. Do that for some tumbled brass and for some washed brass. Post those measements here.
Measure the OD of the expender ball. I'd suspect you are having a lubrication problem, not a dimensional problem. |
|
I wonder if the brass beating itself aroud is peening the case mouth closed to the extent it won't smoothly accept the bullet.
There is nothing that would shrink the brass that I know of. I've seen larger brass(.50) actually dent the case mouth from flopping around in a tumbler. |
|
Quoted:
AeroE; You're probably right, the OP didn't specify if the bullet was crunching the mouth or that he was getting a bulge at the base of the shouder. I should have caught both, must be slipping. 
'Borg The weird thing is, Winchester, WCC, and Lapua have shoulders sufficiently strong to support a little pressure from the crimp ring. I've never found a Remington case that can tolerate even a small additional load beyond that required to seat the bullet without crushing the shoulders, even with the crimp ring just barely in contact. The light finally came on one day while I was loading some .221 Fireball cartridges. |
|
I think I found the culprit, it wasnt my dies. It was the case tumbler. I never had this problem ever so I switched out the liquid with walnut shell and the necks did not shrink at all and it accepts the bullets no problem.
I am still baffled as to why it shrunk, same results with .308WIn and .223, the neck shrunk on both so that it will not accept a bullet, the bullet is wider than the mouth. After putting some in the dry media, the problem was gone. I wonder what stuff they put in that liquid case cleaner crap. Im guessing it was some form of chemical reaction between the case lube and cleaner. I also have a batch soaking in water to dissolve the lube to see if it shrinks or stays sized correctly. |
|
Quoted:
I think I found the culprit, it wasnt my dies. It was the case tumbler. I never had this problem ever so I switched out the liquid with walnut shell and the necks did not shrink at all and it accepts the bullets no problem. I am still baffled as to why it shrunk, same results with .308WIn and .223, the neck shrunk on both so that it will not accept a bullet, the bullet is wider than the mouth. After putting some in the dry media, the problem was gone. I wonder what stuff they put in that liquid case cleaner crap. Im guessing it was some form of chemical reaction between the case lube and cleaner. I also have a batch soaking in water to dissolve the lube to see if it shrinks or stays sized correctly. This is total garbage. You have been given some good advice above. Make the measurements and adjustments suggested and get back to us. Necks don't shrink in cleaning. If they do, you have somehow screwed up ROYALLY. We await your data. |
| When you tumble with dry media and some polish it leaves a light film of polish and media dust on the inside of the case neck as well as all over the case. This helps the bullet slide into the case. When you use liquid cleaner it leaves the inside of the neck squeeky clean which grabs the bullet during seating. This may or may not be causing your problem. |
|
Quoted:
When you tumble with dry media and some polish it leaves a light film of polish and media dust on the inside of the case neck as well as all over the case. This helps the bullet slide into the case. When you use liquid cleaner it leaves the inside of the neck squeeky clean which grabs the bullet during seating. This may or may not be causing your problem. Not true I clean with an ultra sonic, and it leaves NOTHING in the case neck, and the bullets slide in like butter. 'Borg ETA,, Brass doesn't shrink from ANY liquid,, your dies ARE set wrong |
Armory Sponsor