The Firing Line Forums

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

Reply
 
Thread Tools
Old October 10, 2012, 04:45 PM   #1
Gary L. Griffiths
Senior Member
 
Join Date: April 7, 2000
Location: AZ, IA, WA
Posts: 1,292
Some Observations on Reloading .223 Cases

While resizing/depriming a mixed batch of .223 cases, I noticed that several of the cases resized and deprimed significantly harder than others. At first I thought that it might be that some cases weren't adequately sprayed with lube, but then I realized that virtually all of the cases giving me difficulty were Prvi Partisan (PPU) match cases. I began keeping track of them, and noticed quite a variation in the ease of resizing the PPU cases, that wasn't there in other brands of cases. Here is what I observed:

Prvi Partisan: Mostly an order of magnitude stiffer in resizing and decapping, with a few extremely difficult, and some quite easy.

PMC Bronze: Sweethearts to resize and deprime. Very consistent.

Remington: Also very easy to resize and deprime. Very consistent.

Federal American Eagle: Easy to resize and deprime, despite having crimped primers.

WCC '09 5.56mm. Easy to resize and deprime, despite crimped primers.

Seller & Belloit: Fairly easy to work, but with a few that were more difficult.

There was so much variation in the PPUs, that I saved out one of the more difficult, one of average toughness, and one of the easy ones. I then decided to weigh, measure, and check capacity of each of these cases, plus three randomly selected cases from each of the other headstamps. Here are the results:



The case weights are in grains, and the powder capacity was measured by priming the cases, filling them to overflowing with Varget, leveling the top of the case with a steel ruler, and dumping the powder onto the scale pan.

Not surprisingly, the most difficult PPU case weighed the most, at 96 grains, while the easiest one weighed least, at 93.9 grains. They were the most inconsistent with an average variance of 0.80 grains. I had rather naively thought that, being match ammo, their cases would be most consistent.

The most consistent were the WCC military cases with only 0.00667 grains average variance, followed by the PMC cases, at 0.02 grains.

Of course, three cases isn't an adequate sample to draw too many conclusions with, but as I recall, the WWCs and PMCs were very uniform in how they went through the resizing/depriming operation.

It would seem that the strongest cases would be the Seller and Belloit, but at the expense of case capacity.

Also, it's pretty comforting to know that you apparently can't stuff enough Varget into a .223 case to get into too much trouble, as the maximum loads for most 55-60 gr. bullets are around 27 grains. Double-charging a case is definitely not an issue.

I had been loading mostly PPU cases simply because I had a lot of them. For accuracy, though, I'm going to look at going with WCC military and PMC cases.

Thought this might be of interest.
__________________
Violence is an ugly thing, but not the ugliest of things. The decayed and degraded state of moral and valorous feeling which believes that nothing is worth violence is much worse. Those who have nothing for which they are willing to fight; nothing they care about more than their own personal safety; are miserable creatures who have no chance of being free, unless made and kept so by the exertions of those better than themselves. Gary L. Griffiths, Chief Instructor, Advanced Force Tactics, Inc. (Paraphrasing John Stuart Mill)
Gary L. Griffiths is offline  
Old October 10, 2012, 08:28 PM   #2
mrawesome22
Senior Member
 
Join Date: November 9, 2005
Location: Ohio, Appalachia's foothills.
Posts: 3,779
Case capacity is better measured by filling a fired case with water (no miniscus), weigh, dump water out, weigh again.

Stick powders can, and do, vary fill ratio depending on height and rate of speed the powder is dumped.

Fill a case with Varget, cover the mouth with your finger and give the head a few taps on a hard surface. You will find that the powder level has gone down substantially.

sudo passwd root
mrawesome22 is offline  
Old October 11, 2012, 04:35 PM   #3
Bart B.
Senior Member
 
Join Date: February 15, 2009
Posts: 5,231
Unless you get sub 1/2 MOA groups with any batch of cases, there's no need to sort them by weight, water capacity or powder capacity. Just keep each batch/lot separate and that'll do just fine. The heavier ones may well need a grain less powder to keep peak pressure the same, but even that should not effect accuracy in any way.

Weighing cases to a 1% spread is good enough for even the very best accuracy. How much stuff cases hold will vary even with the same case depending on its shape and whether its been fired or not.
Bart B. 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 11:44 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 0.06740 seconds with 9 queries