Long Range Hunting Online Magazine

Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Reloading

Reloading Berger Bullets


Trimming Case Length

LinkBack Thread Tools Display Modes
Unread 05-30-2012, 11:20 AM
Junior Member
Join Date: May 2012
Posts: 1
Trimming Case Length

Anyone else notice this or is it just me, but i do all my case prep by hand, no power tools or case prep centers, yup it takes time but I don't mind. So I trim my .308 Hornady Match brass to 2.005, but I've noticed after I trim to 2.005 and smooth (chaffer) the outside and inside, then remeasure, it 99% of the time goes back to 2.006. So now I've been trimming to 2.004 then doing the edge smoothing, measuring again and getting my 2.005. Just me ? or anyone else have this happen and notice this ?

Reply With Quote

Unread 05-30-2012, 01:29 PM
Bronze Member
Join Date: Apr 2012
Posts: 43
Re: Trimming Case Length

you're getting a small burr from the de-burring tool. no big deal.
try less pressure when de-burring.
Reply With Quote
Unread 05-30-2012, 01:55 PM
Gold Member
Join Date: May 2012
Location: Ohio
Posts: 601
Re: Trimming Case Length

Turning the necks in steel wool after the chamfering really smooths the facing edge.
Reply With Quote
Unread 05-30-2012, 04:43 PM
Platinum Member
Join Date: Dec 2005
Posts: 2,483
Re: Trimming Case Length

I don't think a couple thousandths spread in a .308's case length makes any difference. They all get a bit shorter when fired, then lengthen a bit when full length sized; growing about 1/1000th inch for each shoot and resize cycle. Keep 'em between 2.000 and 2.010 inch and you won't notice any problems.

How the case mouth's prepped after trimming probably effects accuracy more than anything else. Best way to see if there's a problem is to view some rounds you've seated bullets in looking at the case mouth area through a magnifying glass. If there's bulet jacket peeling off the bullet as scraped by the case mouth, that bullet's now unbalanced. At 150,000 to 200,000 rpm a .308's bullet spins at, that's enough to cause problems. The case mouth's got a sharp edge that's shaving jacket material.

That's usually caused by regular deburring tools angle that leaves a sharp edge on the inside edge. I use a broken screw head Easy Out big enough to fit half way into a 30 caliber case mouth then spin it clockwise. That tool's shallower angle deburs and smooths out that sharp edge. Then I run all cases so prepped over a bore brush spinning in an electric drill. The end result's a nicely rounded inside of the case mouth. No more bullet jacket shaving. No more unbalanced bullets to start down your barrel.
Reply With Quote


Thread Tools
Display Modes

Similar Threads for: Trimming Case Length
Thread Thread Starter Forum Replies Last Post
Case trimming teampete Reloading 6 05-22-2011 01:50 PM
Case Trimming enigma Reloading 3 08-25-2007 08:08 PM
Case length trimming 1kstr Reloading 21 02-28-2007 06:03 PM
Case trimming encoreguy Reloading 2 10-25-2006 05:52 AM
Case Trimming TheHunt Reloading 17 03-27-2006 04:47 PM

All times are GMT -5. The time now is 10:07 AM.

All content ©2010-2015 Long Range Hunting, LLC