Long Range Hunting Online Magazine


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

Reloading Techniques For Reloading


Reply

Polishing a body die?

 
LinkBack Thread Tools Display Modes
  #1  
Old 08-08-2013, 10:38 PM
Silver Member
 
Join Date: Jan 2009
Posts: 460
Polishing a body die?

Anybody ever polish a body die when it's sizing too much? My redding body die is sizing my cases .0035 smaller in diameter than fired. I considered polishing it out with 600 grit wet dry paper until I get .001 smaller than fired diameter. Sound doable?
Reply With Quote
  #2  
Old 08-09-2013, 04:05 AM
Gold Member
 
Join Date: May 2009
Location: Australia
Posts: 733
Re: Polishing a body die?

You don't have to push the case in all the way every time with a body die when a shoulder bump is not required .
Fired case size varies from and easy fit to a sticky hard to chamber case.
So be careful what size case you choose to adustt the die to.
Some cases will spring back .001 coming out of a size die anyway .
.001 critical match could be a bit close when changing brass brands and different batches .
You may have a small base body die and not need one . However I would just try not pushing the case in so far each time and only shoudler bump when needed. Keep lubricant film as thin as possible and keep the die and cases very clean.
Reply With Quote
  #3  
Old 08-09-2013, 09:10 AM
Platinum Member
 
Join Date: Jul 2004
Location: Texas
Posts: 5,421
Re: Polishing a body die?

Back off the die just a little until you get the fit you want Just like Bullet Bumper said.

First take the expander ball out so you don,t over work the case (One is all you need to use for this)
then size the fired brass and check it in the chamber. Keep turning the die down until you get the size/fit you want. Then lock the die in position, remove it from the press and re-install the expander
ball. You should be ready to load now. when you look at the case you may have a very small area of the neck that has not been sized, That's OK.

There is nothing wrong with your dies so don't polish or grind on them.

J E CUSTOM
__________________
"PRESS ON"
Reply With Quote
  #4  
Old 08-09-2013, 09:24 AM
Silver Member
 
Join Date: Jan 2009
Posts: 460
Re: Polishing a body die?

I am running the brass up in the case far enough to get a .001 shoulder bump so it feeds easily in a match. Any more and I get to excessive of a bump and any less I get no bump at all. This die doesn't have an expander, it's strictly a body die. This die is squeezing the cases down .004 when .001 is all that's needed to chamber properly. This excessive squeezing is working the brass 4x more than needed and leading to shorter brass life. I guess the only way to fix it is custom dies made from a fired piece of brass. I have my own reamer so each chamber from now on should be identicle and maybe justify the added cost of the die.
Reply With Quote
  #5  
Old 08-11-2013, 02:50 AM
Gold Member
 
Join Date: May 2009
Location: Australia
Posts: 733
Re: Polishing a body die?

If you have to lapp the die . This is how I would do it.
Machine up a mandrel that fits the neck part of the die neat but with an easy slide fit. Make it long enough to stick out both ends of the die about 2.5 inches.
Gaul up a section of the mandrel that will be inside the die . Machine up a base plug with a pouring hole to one side that centers the shaft in the base of the die then pour molten hard lead alloy into the die so it hardens around the shaft .
push it out when cold. Cut away any part of the lead lapp that you don't want to contact the die such as the shoulder and any sprue in the neck area . Put one end in an electric drill and load up the lead with cutting compound. Lube up the upper part of the shaft and insert it so the upper part of the shaft sticks out the top of the die and runs on centre inside the neck area of the die. Have at it for a while and reload the lapp with cutting compound as required . Have a measure every time you reload the lapp to get any idea of how much is being removed at a time. Re melt and recast the lapp when it gets loose and stops cutting . This way you have a chance of keeping it round as you go.
Reply With Quote
  #6  
Old 08-11-2013, 07:11 AM
Platinum Member
 
Join Date: Dec 2005
Posts: 2,114
Re: Polishing a body die?

I don't think sizing fired case bodys 3/1000ths smaller in diameter is gonna cause any problems. A test with a Federal brass .308 Win. case full length sizing it down that much and setting the shoulder back a thousandth worked fine for 47 reloads on the same case with max loads. My 30 caliber magnum cases are full length sized that much and nary an issue whatsoever.

Bottleneck cases headspacing on their shoulders center perfectly in the chamber up front where it counts when fired regardless of how much clearance there is around the case. Their back end's pushed against the chamber wall by the extractor; this happens with virtually all chambered rounds anyway.

One could lap their die out a bit so cases aren't sized down too much, but I think it would take a rifle and ammo and marksman that shoots no worse than 2/10ths inch at a hundred to tell any difference.
Reply With Quote
  #7  
Old 08-11-2013, 11:01 AM
Silver Member
 
Join Date: Jan 2009
Posts: 460
Re: Polishing a body die?

Bart the reason I'm wondering this is because I'm having to trim my brass so much after each firing. Trimmed brass measures 2.007 after firing it is 2.017. It's growing 10 thou with only bumping .001?? I'm concerned about short brass life with that much growth on each firing.
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Current Poll
How Many Different Cartridges Do You Reload For?
ZERO, all factory ammo - 8.04%
359 Votes
1 - 2.78%
124 Votes
2 or 3 - 14.61%
652 Votes
4 or 5 - 20.39%
910 Votes
6 or 7 - 14.85%
663 Votes
8 or 9 - 8.65%
386 Votes
10 or more - 30.69%
1,370 Vote
Total Votes: 4,464
You may not vote on this poll.

All times are GMT -5. The time now is 03:33 PM.


Powered by vBulletin ©2000 - 2014, Jelsoft Enterprises Ltd.
Content Management Powered by vBadvanced CMPS
All content ©2010-2014 Long Range Hunting, LLC