The Firing Line Forums

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

Reply
 
Thread Tools
Old February 25, 2013, 04:40 PM   #1
hdtramp
Junior Member
 
Join Date: February 24, 2013
Posts: 1
Max OAL?

I just started reloading and I'm confused with Max OAL. My LEE dies for .223 Remington say the max OAL is 2.260 inches yet for a 40 grain ballistic tip it states the Min. OAL is 2.280 inches. Thats .020 over the stated max. Would it be safe to load that .020 under the min. OAL? I know they keep it safe, but this makes no sense to me. Any help would be appreciated, thanks.
hdtramp is offline  
Old February 25, 2013, 05:00 PM   #2
AllenJ
Senior Member
 
Join Date: December 11, 2009
Location: Northern California
Posts: 1,283
Per Hodgdon's Reloading Data Center (http://data.hodgdon.com/cartridge_load.asp) your overall length should be 2.280" and that is where you should start.
AllenJ is offline  
Old February 25, 2013, 05:03 PM   #3
SL1
Senior Member
 
Join Date: November 8, 2007
Posts: 1,999
In a RIFLE (as compared to a hangun) cartridge, the pressure is usually more a matter of how far the bullet is from the start of the rifling, rather than how far it is seated into the case. A least, that is the concern with making cartridges longer than indicated by the pressure-tested data. The distance to the beginning of the rifling varies a lot from gun to gun, and even changes on the SAME gun as the throat wears/erodes from use. So, the real issues are going to be specific to YOUR gun. And, specific to the particular bullet model number that you are using, because the distance back from the tip of the bullet to the place where it contacts the rifling varies a lot from bullet model to bullet model.

To find-out how long you can load a cartridge in your own gun, you need to gently push the bullet into the rifling from the chamber to see where it touches. There are some tools you can buy to do that. Or, you can use either of two "home brew" methods.

One method is to make a case that holds the bullet just firmly enough to let you chamber it with the bullet seasted way out in the case neck and have the rifling push the bullet back into the case just far enough to let you extract the case and measure the COL without the bullet slipping.

The other method is to get a friend with a pencil hold the bullet gently against the rifling while you push a cleaning rod down the bore from the muzzle and mark it where the muzzle is when it is contacting the bullet. Then remove the bullet and close the action, push the rod down the bore again until it stops at the breech and mark the rod again. Then the max COL is the distance between the marks on the rod.

Both methods have their problems. With the modified case holding the bullet, it is important that it is not held so tightly that the bullet is rammed part way into the rifling, but not held so loosely that the bullet slips in the case when you extract and measure it. With the cleaning rod method, it is important that some sort of flat tip be used on the rod so that a pointed bullet nose doesn't go into the rod a bit and make the resulting measurement too short.

Once you know how long a cartridge CAN be, you still need to decide how l ong you WANT it to be. Accuracy is usually affected by the distance that the bullet travels before reaching the rifling. And, different bullets work best with different distances. Sometimes there are ttwo distances that work, one pretty close to the rifling and one pretty far away.

Another issue with max COL is whether you want the cartridge to fit in a magazine. In many rifles, the magazine length will keep you from loading bullets long enough to reach the rifling. In rifles with long "free bore" (especially Weatherbys) it may not be possible to touch the rifling with the bullet and still have the bullet seated into the case at all.

So, the first step is to find out how the rifling is on YOUR rifle.

SL1
SL1 is offline  
Old February 25, 2013, 05:21 PM   #4
603Country
Senior Member
 
Join Date: January 6, 2011
Location: Thornton, Texas
Posts: 2,262
All I shoot these days in the 223 is that 40 grain Ballistic Tip, and I load it to whatever the Lyman 49th says (which I can't remember at this moment) and get best accuracy. And for what it's worth, my best load is 27.3 gr of H335 Powder and CCI BR4 primers. If you want to try that load, do work up to it, since in my rifle that's a warm load.
603Country is offline  
Old February 25, 2013, 05:43 PM   #5
Unclenick
Staff
 
Join Date: March 4, 2005
Location: Ohio
Posts: 10,247
Hdtramp,

Welcome to the forum.

While the information you've been given is generally true, in this case I suspect a typo and that Hodgdon meant 2.180", but call them to double-check. The problem I have with the data is not only that it violates SAAMI's maximum for a magazine, but that with that short, light weight bullet, 2.280" COL would only put the bearing surface of the bullet an eighth of an inch into the case neck. For a load to feed from a magazine without tipping the bullet on the way in, that isn't much to hang onto. At 2.180" it is about a full caliber into the neck, which is more normal.

But, again, call or email Hodgdon and ask them to explain it, just to be sure.

Nick
__________________
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Benefactor Member
Unclenick 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 05:36 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 0.06518 seconds with 7 queries