The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Reply
 
Thread Tools
Old February 11, 2002, 04:59 PM   #1
Poodleshooter
Senior Member
 
Join Date: August 7, 2000
Location: Floating down the James River in VA
Posts: 2,539
Effect of trim length variance on non-crimped loads

Has anyone ever found a vast velocity or accuracy spread from non-crimped loads with wide variances in trim lengths???
I recently accidentally primed a bunch of .223 brass that I trimmed on my Lee trim kit. Over a batch of 300 rounds, the trim variance goes from 1.760" (max OAL)-1.740" (.010 under the trim length). I was going to trash this brass, but now that I've primed it, I'm trying to decide whether to write it off. I've sorted it into lots by trimmed length, so the box by box extreme length spread isn't more than .003".
I never crimp on my .223 loads due to the high powder density,so should I trash it, load it as blasting ammo, or load it up with decent bullets and not sweat it?
Poodleshooter is offline  
Old February 11, 2002, 09:47 PM   #2
ryucasta
Senior Member
 
Join Date: February 4, 2002
Location: Los Angeles, CA
Posts: 431
I would not sweat it the difference is negligible. My biggest concern would be are you using mixed head stamps. Since the different manufacturers of brass tend to have different case thickness and that will directly affect the performance of your rounds.
ryucasta is offline  
Old February 11, 2002, 10:29 PM   #3
C.R.Sam
Senior Member
 
Join Date: October 29, 1999
Location: Dewey, AZ
Posts: 12,859
Yeah, different makers and lots probably make more difference than your case length variation.

Please report your results.

Sam
C.R.Sam is offline  
Old February 12, 2002, 01:45 PM   #4
Poodleshooter
Senior Member
 
Join Date: August 7, 2000
Location: Floating down the James River in VA
Posts: 2,539
Cases are all the same lot of Malaysian soft 5.56 brass. It's crap brass that I cut and primed in a hurry for FMJ plinking loads (which I have subsequently given up on due to my HBAR barrel's propensity for destroying light 55gr bullets). The headstamps are barely readable, and there are extractor marks on the rim, but there are no interior rings or other imminent case failure signs. I've segregated them into batches with differences of .003", and loaded them with several test loads using WC846 (BallC2), AA2495 and 2520, CCI SR primers and Hornady 68gr BTHP match bullets loaded to 2.255 OAL. I'll report after firing them over the weekend. Powder weight data was from Hornady and Accurate Arms, but conflicts by nearly 10% with Sierra data for the same bullet weight, so I will refrain from posting it.
Poodleshooter is offline  
Old February 12, 2002, 08:52 PM   #5
Fatelvis
Senior Member
 
Join Date: June 10, 2001
Location: Lockport, IL
Posts: 488
As long as the longest case isnt over the max allowable, they`ll all be safe to fire. As far as accuracy, I think you`re wise for seperating them by headstamp, but the difference between the longer and shorter cases probably wont be detectable, especially in a stock rifle. Have fun shooting, and forget about the piddly details, that the gunwriters and benchresters worry themselves about!
Fatelvis is offline  
Old February 22, 2002, 12:43 PM   #6
Poodleshooter
Senior Member
 
Join Date: August 7, 2000
Location: Floating down the James River in VA
Posts: 2,539
Well, so much for that worry. I put 5 rounds into just under 1" at 100yds on a mildly windy day (and I have the flu!). Not a bad load!
Poodleshooter is offline  
Old February 22, 2002, 02:46 PM   #7
C.R.Sam
Senior Member
 
Join Date: October 29, 1999
Location: Dewey, AZ
Posts: 12,859
What works
Does.

Thanx for the report.

Sam
C.R.Sam 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 12:09 PM.


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 0.08897 seconds with 9 queries