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Posted: 10/21/2013 6:17:41 PM EDT
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Situation:
I know trimmer indexes of the case shoulder rather than the case head Using 1F LC brass multiple years. All sized with Redding 223 Full length die. All on Forrester Press. All fully entering the die. All good on headspace drop in gage except I am getting different overall lengths. Most overs are 2001 & 2008 cases but not all Vast majority are coming out right on the mark I set of 1.51 but I'm getting some at 1.55 to 1.59. I run them through the die again but no change... Can there really be that big of a difference in rim & web size? Am I missing something? Thoughts 
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If the sizer is changed between sizing sessions, the cases will be slightly different in length at the shoulder, even with careful adjustment to get the new batch identical.
Lube also makes a difference, but that's a little easier to keep uniform. If you are using a Lyman gage, check the rim diameters for any suspect cases by turning them around in the gage. Lyman gages are cut too small for .223 Rem case rims that run to the high side of tolerance (0.378 inches diameter). |
| I have found that if I resize all the brass that I want to work with in one session without removing the die or making setting changes to the die, and then trim all of the brass, all of my brass will trim to within 0.001 variance with my Giraud trimmer. If I resize the brass in multiple sessions, basically putting the die away after each use, and trim the brass all together from the multiple resizing sessions, I might experience a variance of up to 0.004 trim length overall. |
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Fired from:
Multiple rifles including SAW Case gage: Lyman Yes I twist all cases in the trimmer Die settings changed: Die was never adjusted although it was removed from the press Lube: I used Imperial on some and RCBS spray on others. If the lube what actions should I take? |
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Quoted:
Die settings changed: Die was never adjusted although it was removed from the press I think this is the key. I just resized 2 thousand pieces of brass last week and kept the brass in gallon ziplock bags, 4 bags = 500 ea., 3 of the bags of 500 pieces was done in 1 sitting without ever removing the die from the press and all of these together had a variance of 0.001 at the most, many were zero variance at all. About 1/2 way through the last bag the die was removed from the press one time and the variance of this bag of 500 pieces was at maximum 0.004, and many pieces had zero variance, this is why I attribute the trim variance to the die. |
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Quoted:
with my WFT which also works off the shoulder, I found out if use brass shot in different guns, even though Full Length Sized it comes out different lengths. From same gun comes out much more uniform. ^^^ This is exactly why I don't use one of these... A ran into this problem with the wft |
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Update:
Ran brass that was still coming out over 1.76 back through the press and then back through the trimmer: No change still over max spec Cleaned off the original case lube applied new lube and repeated process: Trimmed down to below 1.76 to 1.758 even though trimmer set for 1.752 Cleaned annealed and repeated process: Came out to 1.753! Thanks for the help guys! |
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Quoted:
Update: Ran brass that was still coming out over 1.76 back through the press and then back through the trimmer: No change still over max spec Cleaned off the original case lube applied new lube and repeated process: Trimmed down to below 1.76 to 1.758 even though trimmer set for 1.752 Cleaned annealed and repeated process: Came out to 1.753! Thanks for the help guys! good to see you solved it. for what it's worth. i've found no difference in annealed vs. unannealed brass. my hornady lock die is set to the size i like them (.002 off my fired case size) I lube with homebrew, size em. clean them in media (wet or dry depending on if i'm shooting them soon or storing) next i trim to 1.758. never a problem except the rare one that i find off sized and i check and find it must not have sized correctly. (usually lube issue or neck exander was getting dry) |
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