Catpop
Member
I found out by accident it does make a difference. What is the norm?
Tx Catpop
Tx Catpop
trim: pre or post resizing?
- Thread starter Catpop
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jwrowland77
Member
Norm is to trim after resizing, as resizing will make the case grow/stretch.
rcmodel
Member in memoriam
Plus, the trimmer pilot is a loose fit in an unsized case neck and chattering or a crooked cut may result.
Always size before trimming.
rc
Always size before trimming.
rc
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lightman
Member
Gotta agree with all of the above. Resize then trim.
32_d3gr33s
Member
wait wait wait... are you telling me to resize then trim? I always thought it was trim after resizing....
allaroundhunter
Member
I sincerely hope this is sarcasm....
32_d3gr33s
Member
lol... try reading it again
allaroundhunter
Member
Wow, my reading comprehension was apparently nonexistent. That's what I get for pulling an all-nighter studying...
stubbicatt
Member
forestswin
Member
I've always trimmed after resizing, but what say you all when the pilot is tight or won't fit into the sized case?
allaroundhunter
Member
Use a smaller pilot.
Potatohead
Member
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Got me too..
In answer to forestwin's question, I resize and then trim but before I trim I run my cases through the expander die and also make sure that the case mouths are chamfered (only have to do the chamfer once with handgun cases). I used to have the same problem that you are running into with the pilot sticking in the case until I started doing the above and the problem in now non-existant.
OP
OP
Catpop
Member
Wow, I better trim post resizing or resize pre trimming. Man am I confused, but then again I wander thur life that way.
Tx Catpop
Tx Catpop
forestswin
Member
milt
I expand before trimming too. So I expand, trim then debur and chamfer if the pilot is too tight. I was curious if anyone did anything different.
cfullgraf - I use a Hornady Camlok trimmer - what trimmer do you use?
I expand before trimming too. So I expand, trim then debur and chamfer if the pilot is too tight. I was curious if anyone did anything different.
cfullgraf - I use a Hornady Camlok trimmer - what trimmer do you use?
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higgite
Member
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You could trim before and after sizing, just to be sure.
Andrew Leigh
Member
Curiously the statement has been made that cases grow after sizing.
Brass flow (case growing) happens during firing. Secondly that when resizing that you actually bump the shoulder back causing the case to shrink in length. So you actually reduce the case size during sizing, albeit not always enough to avoid trimming.
If your cases grow after sizing (which I have had) this is due to insufficient lube on the inside of the case neck and the friction on the return stroke is sufficient to stretch the shoulders back out after having bumped them back originally.
Brass flow (case growing) happens during firing. Secondly that when resizing that you actually bump the shoulder back causing the case to shrink in length. So you actually reduce the case size during sizing, albeit not always enough to avoid trimming.
If your cases grow after sizing (which I have had) this is due to insufficient lube on the inside of the case neck and the friction on the return stroke is sufficient to stretch the shoulders back out after having bumped them back originally.
I think part of what you said there is true but not all..After firing my cases do indeed "shrink" in length. This can be easly confirmed with my calipers..Even with VERY good lube inside the neck they do indeed "grow" in length after resizing. Again, confirmed with calipers.. The amount can vary but in general..The case snaps back about .007 and after resizing they go back to just about 1.750 which is where they started at..YMMV..
moxie
Member
Chamfering and deburring should be done AFTER trimming. When you trim you create a new sharp edge.
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