SAAMI Pressure Chart - Shooters Forum
» Advanced

Go Back   Shooters Forum > Handloading > Handloading Procedures/Practices
Register FAQ Members List Donate Calendar Search Today's Posts Mark Forums Read



Like Tree7Likes
Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1  
Old 06-16-2005, 05:14 AM
Ranch Dog's Avatar
Beartooth Regular
 
Join Date: Oct 2003
Location: Cuero, TX
Posts: 3,853
SAAMI Pressure Chart


Registered Users do not see the above ad.


Does anybody know where there is a SAAMI MAX PSI chart for ALL modern cartridges? I'm looking for the PSI values, not CUP.

Ramshot has one but it is just for the cartridges that they offer load data for... http://www.ramshot.com/powders/loadpressure.php
__________________
Michael
Reply With Quote
  #2  
Old 06-16-2005, 06:22 AM
Jack Monteith's Avatar
Beartooth Regular
 
Join Date: Dec 2000
Location: Saskatchewan
Posts: 7,788
This chart is part PSI and part CUP, but it's dated 2004, so it may be the best you can get.
http://www.leverguns.com/articles/saami_pressures.htm

Saami publishes them, but they aren't cheap.
http://www.saami.org/docs/SAAMI_lit.pdf

Bye
Jack
Reply With Quote
  #3  
Old 06-16-2005, 10:12 AM
MikeG's Avatar
The Hog Whisperer (Administrator)
 
Join Date: Jan 2001
Posts: 32,637
That's pretty handy, Jack.... do you know of a similar source for chamber drawings?

Think this is deserving of a 'sticky' as this comes up a lot on the forum....
__________________
MikeG

Quote:
Originally Posted by faucettb
Welcome to the forum. Rules are simple, be nice and join in.
Reply With Quote
 
  #4  
Old 06-16-2005, 10:29 AM
Jack Monteith's Avatar
Beartooth Regular
 
Join Date: Dec 2000
Location: Saskatchewan
Posts: 7,788
There's some levergun chamber drawings here.
http://www.leverguns.com/dimensions/Default.htm

Reamer dimensions here:
http://www.clymertool.com/cgi-bin/reamer.cgi?

Bye
Jack
Reply With Quote
  #5  
Old 06-16-2005, 12:43 PM
MikeG's Avatar
The Hog Whisperer (Administrator)
 
Join Date: Jan 2001
Posts: 32,637
Thanks, Jack!
__________________
MikeG

Quote:
Originally Posted by faucettb
Welcome to the forum. Rules are simple, be nice and join in.
Reply With Quote
  #6  
Old 07-02-2005, 03:16 AM
Ranch Dog's Avatar
Beartooth Regular
 
Join Date: Oct 2003
Location: Cuero, TX
Posts: 3,853
Still working on a complete chart for PSI and the Marlin Rifle calibers. Here is what I have so far...

__________________
Michael

Last edited by Ranch Dog; 10-11-2006 at 04:26 AM.
Reply With Quote
  #7  
Old 07-17-2005, 09:57 AM
Beartooth Regular
 
Join Date: Feb 2004
Location: Poulsbo Washington
Posts: 573
RD you have mail. Randy
__________________
GBOT GBUSA
Reply With Quote
  #8  
Old 07-17-2005, 01:34 PM
Ranch Dog's Avatar
Beartooth Regular
 
Join Date: Oct 2003
Location: Cuero, TX
Posts: 3,853
Thanks Randy, I got the mail and appreciate the information.
__________________
Michael
Reply With Quote
  #9  
Old 10-15-2005, 09:46 AM
Beartooth Regular
 
Join Date: May 2005
Posts: 340
I'm really confused about the .356 and .375. Their SAAMI limits are roughly equivalent to 57K in terms of PSI. Even Paco Kelly doesn't load his 336s that hot.

MC
Reply With Quote
  #10  
Old 10-16-2005, 05:10 AM
Ranch Dog's Avatar
Beartooth Regular
 
Join Date: Oct 2003
Location: Cuero, TX
Posts: 3,853
Quote:
Originally Posted by MarlinCollector
Even Paco Kelly doesn't load his 336s that hot.
That might have something to do with why Marlin isn't offering the chamberings any more. Actually, the PSI conversion is more to the order of 60.9K!

The 356 Win was designed to the same pressure limits as the 358 Win. Knowing the lever-action design wasn't up to the those limits, Winchester used thicker case walls to contain the pressure and that is why the case capacity isn't the same as the 358 Win. Same story with the 307 vs. 308 (62K... what was Winchester thinking!) and 375 vs. 38-55.

Most argue that you can't convert CUP to PSI and PSI to CUP. Not so, the problem only stems to lack of a standard in collecting early CUP data. The calculation is:

CUP to PSI:
=-17902+(1.516*(CUP))

PSI to CUP
=((PSI)+17902)/1.516

These formulas are formated so that you can paste them directly into a XLS spreadsheet. Just insert a cell address over CUP or PSI. Here is a link to a paper on the formula:
Correlating PSI and CUP by Denton Bramwell

It will be interesting to see what happens to some of the numbers as SAAMI re-evaluates the standard from CUP to PSI. Look at the 35 Rem... it actually gained some thump! Enter the 35 Rems CUP of 35K into the formula, it converts to 32.8K CUP. The new PSI reference is 35.0K PSI. Same story with the 30-30 Win. The 444 Marlin lost a bit.
__________________
Michael

Last edited by Ranch Dog; 10-16-2005 at 05:19 AM.
Reply With Quote
  #11  
Old 10-25-2005, 01:53 PM
Registered User
 
Join Date: Sep 2002
Location: central Illinois
Posts: 15
I've been working on a pressures chart, but it is not very complete as yet with regards to modern cartridges. My interests lie with the older, rimmed cartridges. Unfortunately, I do not have access to the most up to date SAAMI information, eg. modern .405 WCF. The book they sell is over 10 years old, and it does not include many cartridges. I don't believe they keep the printed copies up to date; you should try the CD version. I have more information on the standards from Europe's CIP, which is SAAMI's counterpart there.
Reply With Quote
  #12  
Old 11-22-2005, 07:35 PM
Beartooth Regular
 
Join Date: Feb 2004
Posts: 26
Can anyone guess why 284 Winchester went from 54,000 CUP to only 56,000 PSI while most others, such as 308 Winchester converted more directly, i.e. 54,000 (or 52,000?) CUP to 62,000 PSI?
Reply With Quote
  #13  
Old 11-22-2005, 08:27 PM
Jack Monteith's Avatar
Beartooth Regular
 
Join Date: Dec 2000
Location: Saskatchewan
Posts: 7,788
That formula isn't too reliable as there's some significant outliers when you apply it to enough common cartridges. The .284 looks like the biggest one yet, but the .270 Winchester and 7-08 Remington are outliers too, and in opposite directions. See the chart I worked up in this old post.
http://www.shootersforum.com/showthread.htm?t=8512

Bye
Jack
Reply With Quote
  #14  
Old 01-25-2006, 05:01 PM
Registered User
 
Join Date: Jan 2006
Location: Quebec,Canada
Posts: 9
Hi,

Does anybody know if there is a SAAMI MAX PSI data for the Smokeless Savage muzzleloader ?

Most members on some other muzzleloader say that they do not exceed 35,000 to 38,000 psi.

Is there a standard, a SAAMI max ?

Thank you............................................Gé rald...../
Reply With Quote
  #15  
Old 09-17-2006, 05:16 PM
Beartooth Regular
 
Join Date: Apr 2006
Location: EAST CENTRAL BAMA
Posts: 797
There is some intresting reading on this very topic in the september Shooting Times. Ken Oehler the guy who makes crono's and such has just signed on to do a monthly column. His first writing is on this very subject! you may can access this from the net.
Reply With Quote
  #16  
Old 10-24-2006, 11:38 PM
Tang's Avatar
Beartooth Regular
 
Join Date: Feb 2004
Location: Virginia
Posts: 3,366
I was wanting to know about the .325 WSM. COuldnt find it anywhere. So I looked in all the reloading info I could find. None of them seem to go above 64k psi. Seen one dead on 64k, but never above. So Im guessing the .325 WSM is probably maxxed at somewhere between 64k and 65k.
Reply With Quote
  #17  
Old 10-25-2006, 08:06 AM
James Gates's Avatar
Beartooth Regular
 
Join Date: Dec 2000
Location: Old Town, Florida
Posts: 2,435
Interesting, but I wonder how many know why they set certain pressure limits on certain cartridges?
The answer is simple and complex at the same time. The specs have to be set, per cartridge based on their best evaluation, to match the weakest existing action out in the field that are still being used.........and that takes some doing!
Good examples of this was the specs on .257 Roberts (many in early Spanish actions brought back from the Spanish/American War) and 8mm Mauser (many 1888 rifles with smaller grovres).
Dixie Slugs ran into this early, since the specs are low on the 12 ga 3" Mag. It is interesting to see the specs on the 12 ga 3 1/2" Mag vs the 12 ga 3" Mag........with both on the same frames.
Then things got real complicated in certain 12 ga specs since there are now rifled shotgun barrels! Take the example that there are now rifled shotgun barrels on rifle actions lke the NEF rifle actions that can have 280 Remington barrels sent from the factory.
So.....The gun and ammo co's have to deal with all this, including shotguns the have front locking lugs locking into the barrel extension (very strong) vs older models with rear lugs locking into the frame (not so strong).
Because of the reasons above the specs must be on the ultra conservative side......something to think about?
Regards, James
__________________
Dixie Slugs of Old Town Hammock, Florida
"Home of the Dixie Terminator Slug"
Reply With Quote
  #18  
Old 12-28-2006, 11:48 AM
Jack Monteith's Avatar
Beartooth Regular
 
Join Date: Dec 2000
Location: Saskatchewan
Posts: 7,788
There's a discussion of CUP vs. PSI over at 24HourCampfire, and Ken Howell and Ken Oehler really get into the details. Let's say that any conversion formula is dubious at best.
http://www.24hourcampfire.com/ubbthr...page=0#1156593

Bye
Jack
Reply With Quote
  #19  
Old 12-31-2006, 05:01 AM
Beartooth Regular
 
Join Date: Dec 2006
Location: Caldwell, ID
Posts: 881
Ken Oehler usually hangs out on the 24Hourcampfire forum. He goes by his name as one word: KenOehler
Reply With Quote
  #20  
Old 01-01-2007, 05:42 AM
Ranch Dog's Avatar
Beartooth Regular
 
Join Date: Oct 2003
Location: Cuero, TX
Posts: 3,853
I'd rather fill my case with powder and blow my rifle up than read through that thread on 24 HCF... Holy Crap, HGAS! Two guys with a lot of brain power. Boom... dead deer... that's what I care about.

I believe they are convertible. They are numbers and if they aren't, they are both in error. I've done enough shooting with pressure equipment to know they are.
__________________
Michael
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
25-35 loads Dr. A Handloading Procedures/Practices 178 03-27-2017 10:26 AM
CUP vs. PSI Ranch Dog Handloading Procedures/Practices 55 09-04-2012 09:25 AM
4831 - Hodgdon, IMR ? flashhole Handloading Procedures/Practices 15 04-26-2005 08:44 AM
Developing loads & pressure signs Taylor Handloading Procedures/Practices 8 10-14-2004 12:28 AM
Powder Burn Rate Chart William Iorg Handloading Procedures/Practices 0 03-27-2003 05:02 AM


All times are GMT -8. The time now is 01:00 AM.

< Contact Us - Shooters Forum - Archive - Privacy Statement >

 
 

All Content & Design Copyright © 1999-2002 Beartooth Bullets, All Rights Reserved
Privacy Statement | Contact Webmaster
Website Design & Development By Exbabylon Internet Solutions
Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1