The Firing Line Forums

Go Back   The Firing Line Forums > The North Corral > Competition Shooting

Reply
 
Thread Tools
Old December 23, 2010, 11:02 AM   #1
Ervin
Junior member
 
Join Date: October 9, 2009
Posts: 125
Case trimming?

Since I still dont have a trimmer, Ive kept my cases within the same .10 of a mm and hoped for best results. I dont shoot benchrest either, just service rifle.
I know consistency is the name of the game but I keep hearing that the difference is very small
Ervin is offline  
Old December 23, 2010, 11:10 AM   #2
kraigwy
Senior Member
 
Join Date: June 16, 2008
Location: Wyoming
Posts: 9,371
Excessive case length does effect accuracy. Cases grow when fired and reloaded and MUST be trimmed to the same length.

I have no ideal why one wouldn't want to trim the cases.

Lee's little case trimmer are cheap and accurate, easy to use.

Maybe it's just me, but my accuracy is worth the few bucks it takes to trim the cases.
__________________
Kraig Stuart
CPT USAR Ret
USAMU Sniper School Oct '78
Distinguished Rifle Badge 1071
kraigwy is offline  
Old December 23, 2010, 12:23 PM   #3
armoredman
Senior Member
 
Join Date: May 22, 2007
Location: Arizona
Posts: 3,738
I trim with the horrible Lee hand trimmer, destroys my ability to hold anything for an hour afterwards, BUT it does the job, and I haven't been able to get a Zip Trim yet. Someday I'll get the Forster trimmer, and the cast boolit hollow poiting accessory, too.
__________________
http://czfirearms.us/ same original CZForum, new location.
armoredman is offline  
Old December 23, 2010, 12:43 PM   #4
4runnerman
Senior Member
 
Join Date: January 16, 2010
Location: Minnsota
Posts: 2,759
Maybe it's just me, but my accuracy is worth the few bucks it takes to trim the cases.

No kraigwy you are not alone. I have taken all your advice along with others and the results are very apperant in my groups. If your a weekend shooter trying to hit a paper plate at 200 yards don't worry about it,but if your an anal shooter going for extreame tight groups,jump on the band wagon and start doing it.
4runnerman is offline  
Old December 23, 2010, 12:52 PM   #5
joneb
Senior Member
 
Join Date: December 10, 2005
Location: Central , OR
Posts: 1,729
The Wilson case trimmer works well, http://www.lewilson.com/casetrimmer.html
joneb is offline  
Old December 23, 2010, 01:07 PM   #6
jimbob86
Senior Member
 
Join Date: October 4, 2007
Location: All the way to NEBRASKA
Posts: 6,702
Quote:
Lee's little case trimmer are cheap and accurate, easy to use.
Especially easy if chucked into a 3/8" drill. Much faster, too.
Quote:
I trim with the horrible Lee hand trimmer, destroys my ability to hold anything for an hour afterwards,
Either you have arthritis issues or you have not put it into a drill, or both......

A used drill can be had at a pawn shop for next to nothing ..... I have one that I don't use for anything else......
__________________
TheGolden Rule of Tool Use: "If you don't know what you are doing, DON'T."

http://nefirearm.com/
jimbob86 is offline  
Old December 23, 2010, 02:31 PM   #7
Ervin
Junior member
 
Join Date: October 9, 2009
Posts: 125
whats the case length uniformity you can achieve?

with in the same .05 (.05-.10) of a mm?
I need an idea of how close people are able to get these cases
Ervin is offline  
Old December 23, 2010, 02:38 PM   #8
Hog Hunter
Senior Member
 
Join Date: August 14, 2009
Location: Georgia
Posts: 386
To me the case lenght is one of the most important steps to accuracy. I try to keep everyone of mine within 2 thousanths of each other. I also use the manual lee trimmer and it'll wear you out after abox of sheels but its worht it at the range and even more importantly in the woods!! I also throw away alot of brass that is short. Im really picky when it comes to laoding up a round im gonna try to take an animal with.
Hog Hunter is offline  
Old December 23, 2010, 03:36 PM   #9
4runnerman
Senior Member
 
Join Date: January 16, 2010
Location: Minnsota
Posts: 2,759
Well said Hog Hunter. It's the little things that add up,,Like flash hole cleaning,primer pocket cleaning ,case weight,trimming.All these indivigual things add like 1 or 2 or so% to your accuracy. I want all the % i can get.
4runnerman is offline  
Old December 23, 2010, 10:15 PM   #10
Ervin
Junior member
 
Join Date: October 9, 2009
Posts: 125
Ive cleaned the primer pocket lately but honestly whats the big argument behind this?

do you people weigh the cartridge after it's reloaded for a specific reason?
Ervin is offline  
Old December 23, 2010, 10:19 PM   #11
jimbob86
Senior Member
 
Join Date: October 4, 2007
Location: All the way to NEBRASKA
Posts: 6,702
Cleaning primer pockets

Quote:
Ive cleaned the primer pocket lately but honestly whats the big argument behind this?
1. Makes it easier to prime.

2. Primer seating depth is more uniform than if some have some crud at the bottom and some don't. Uniformity = precision = repeatable accuracy.
__________________
TheGolden Rule of Tool Use: "If you don't know what you are doing, DON'T."

http://nefirearm.com/
jimbob86 is offline  
Old December 23, 2010, 10:28 PM   #12
Ervin
Junior member
 
Join Date: October 9, 2009
Posts: 125
They'll seat fine even after 2 shots worth of carbon inside the pocket...
Ervin is offline  
Old December 23, 2010, 10:30 PM   #13
jimbob86
Senior Member
 
Join Date: October 4, 2007
Location: All the way to NEBRASKA
Posts: 6,702
Trimming cases is important......

.......for safety reasons, too:

".....if the case mouth begins to enter the throat of the rifle, hard chambering and high pressures can result."

- Speer #13, p. 68

Jam that bolt closed so the case mouth is pinched between the throat and the bullet, and things could get ....... interesting ........
__________________
TheGolden Rule of Tool Use: "If you don't know what you are doing, DON'T."

http://nefirearm.com/
jimbob86 is offline  
Old December 23, 2010, 10:31 PM   #14
4runnerman
Senior Member
 
Join Date: January 16, 2010
Location: Minnsota
Posts: 2,759
I weigh my cases after they are deprimed and tumbled. Sorted down to 1 gn difference. I shoot 223 and when i weighed my cases i found out just in 223,they came in from a low of 88 gns to a high of 108 gns. If you throw them all together and load all with same gns of powder they are still not going to group the same. 93 gns was the most common. So i pulled all 93 gns and trashed the rest. Keep in mind this is all bearing on how accurate you want to be and how much your willing to put into it. But as stated earlier,case lenght is by far the most important of them all.

((They'll seat fine even after 2 shots worth of carbon inside the pocket,,))

Seating fine and seating right are not the same thing. One can shoot 20 times and still push a primer into the pocket. Difference i can't say much as i have never tested the theary. I just do it as a part of reloading. Just like cleaning flash hole,never not done it ,to tell you if it makes a difference.

Last edited by 4runnerman; December 23, 2010 at 10:40 PM.
4runnerman is offline  
Old December 23, 2010, 10:34 PM   #15
Wag
Senior Member
 
Join Date: October 22, 2010
Location: Rio Rancho, NM
Posts: 572
I even trim my straight wall pistol cases which most people do not.

Worth it to take the time. Get a good trimmer and do it!

Also, you don't have to full length resize every time you load a case, either. Sometime, you can get away with neck sizing only but I'm not as familiar with how that works on a bottle neck rifle cartridge. I have some reading to do!

--Wag--
__________________
"Great genius will always encounter fierce opposition from mediocre minds." --Albert Einstein.
Wag is offline  
Old December 23, 2010, 11:31 PM   #16
jimbob86
Senior Member
 
Join Date: October 4, 2007
Location: All the way to NEBRASKA
Posts: 6,702
Quote:
They'll seat fine even after 2 shots worth of carbon inside the pocket...
Sure, if you mash 'em in there hard enough..... they'll seat, but will they seat uniformly?

Uniformity=Precision=Repeatable Accuracy
__________________
TheGolden Rule of Tool Use: "If you don't know what you are doing, DON'T."

http://nefirearm.com/
jimbob86 is offline  
Old December 24, 2010, 02:11 AM   #17
Ervin
Junior member
 
Join Date: October 9, 2009
Posts: 125
No they seated perfectly even after 2nd firing, primer was flushed across the bottom of the case, didnt bulge out and fired perfectly...
Ervin is offline  
Old December 24, 2010, 08:35 AM   #18
4runnerman
Senior Member
 
Join Date: January 16, 2010
Location: Minnsota
Posts: 2,759
((No they seated perfectly even after 2nd firing, primer was flushed across the bottom of the case, didnt bulge out and fired perfectly))

Yes they did. Won't hassel you for that,but did you lose 1% accuracy because of it?. That we will never know. All of us in here arejust trying to give you little tips and tricks that we have leaned in our time loading.
Everything people will post in here will have to do with how much you are willing to do and what kind of accuraccy you are after. All these little things when put together make a difference in your accuracy. I will say some of these things will make no difference if you are only shooting 100 or 200 yards and are happy with one inch groups at those distances. All said in here is based on what you concider accurate and what you are happy with. With your primer pocket cleaning,By not doing it, the ignition of your powder COULD be different causing a different burn rate from shell to shell. The only way you would notice things like that are over a chroney, One could be at 3200 fps and the next at 3250 fps,again at a short distance 100 or 200 yards that will not matter to much.Strech that out to 400 yards and now it is going to come into play with a POI that is not the same. You have to ask yourself,,,What do i want to be able to do (hit a quarter or hit a dime), Most of us here want a dime or smaller


Cost savings for me and most in here is just half the reason we reload our own,The biggy for me is accuracy. Im what someone in here on another topic calls.. A Bench Rest Ninnie. (not sure what that means,but oh well.).

Last edited by 4runnerman; December 24, 2010 at 09:05 AM.
4runnerman is offline  
Old December 25, 2010, 03:16 AM   #19
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 3,142
"...Since I still dont have a trimmer, I've kept my cases within the same .10..." How?
__________________
Spelling and grammar count!
T. O'Heir is offline  
Old December 25, 2010, 09:22 AM   #20
4runnerman
Senior Member
 
Join Date: January 16, 2010
Location: Minnsota
Posts: 2,759
"...Since I still dont have a trimmer, I've kept my cases within the same .10..." How


New brass? lightloads? luck?. Take your pick.

Have a merry christmas
4runnerman is offline  
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 07:13 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.11885 seconds with 7 queries