Long Range Hunting Online Magazine


Go Back   Long Range Hunting Online Magazine > Rifles, Reloading, Optics, Equipment > Rifles, Bullets, Barrels and Ballistics


Reply

bearing surface & pressure

 
LinkBack Thread Tools Display Modes
  #1  
Old 07-10-2004, 07:33 PM
Platinum Member
 
Join Date: Mar 2003
Location: Southern Wisconsin
Posts: 1,308
bearing surface & pressure

I'm in the process of finishing the stock for a new 6.5-.284 win.. So it's time to start reloading for it.
I've been going through my manuals and am a little confused.
Nosler lists 52.5 grs of Re 22 or 50.0grs. of IMR 4831 for their max load with a 140 gr partition.
Sierra lists 47.5grs of Re22 or 46.7grs of IMR 4831 for their max load with a 140 gr Matchking.
Now I realize a bullet with a longer bearing surface will have little a higher pressure, but my question is how much does a bullets bearing surface affect pressure. Does Sierra just err on the side of caution or is there a justification for a nearly 5 grain max load difference with a 140 gr bullet?
Thanks in advance
Chris
__________________
Ignorance can be treated with education, sadly there is no cure for stupidity.
Reply With Quote
  #2  
Old 07-10-2004, 07:49 PM
Gold Member
 
Join Date: Sep 2002
Location: Illinois
Posts: 836
Re: bearing surface & pressure

I may be wrong, but I think every loading situation is different, bbls., brass, primers, chamber etc., and I think they are up front with their data. I have found some max loads in at least one of my rifles is below max in someone elses with the same barrel, twist and bullet. Guess you'll have to work with data as a guide and find max for your weapon. Good luck, [img]images/icons/grin.gif[/img]
db
Reply With Quote
  #3  
Old 07-11-2004, 10:30 AM
Platinum Member
 
Join Date: May 2001
Posts: 2,369
Re: bearing surface & pressure

What's the publish dates on the loading manuals? I have some older loading books and they tend to have "hotter" loads listed.
Reply With Quote
  #4  
Old 07-11-2004, 11:30 PM
Platinum Member
 
Join Date: Mar 2003
Location: Southern Wisconsin
Posts: 1,308
Re: bearing surface & pressure

Dave
The Sierra is a year old and the Nosler is the fifth edition printed in 2002.
__________________
Ignorance can be treated with education, sadly there is no cure for stupidity.
Reply With Quote
  #5  
Old 07-12-2004, 05:14 AM
MAX MAX is offline
Silver Member
 
Join Date: Sep 2001
Posts: 263
Re: bearing surface & pressure

I agree with db, the variables are many and in some cases complex. Comparing the Partition with the MK is apples and oranges. One has exposed lead on a flat base, the other a copper healed boat tail. Bearing length aside, you will get different levels of obturation, different barrels/actions/components were used to develope the loads and to "argue" the data is akin to arguing with a stop sign.

On another level however, I've always viewed load manuals as guidelines, not the gospel.

*I was known as MAX until I had a name change operation.

[ 07-12-2004: Message edited by: DigitalDan ]
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes


Similar Threads for: bearing surface & pressure
Thread Thread Starter Forum Replies Last Post
Bullet Weight vs. Bearing Surface padd54 Rifles, Bullets, Barrels and Ballistics 12 12-19-2010 12:42 PM
Bearing surface length? txsendero Rifles, Bullets, Barrels and Ballistics 3 12-23-2009 06:58 PM
Bearing surface tolerance JAWZ Reloading 10 06-30-2009 11:05 AM
Sort bearing surface? jmden Rifles, Bullets, Barrels and Ballistics 1 10-08-2008 07:41 AM
Measuring bullet bearing surface? Dan B Rifles, Bullets, Barrels and Ballistics 10 06-11-2006 06:16 AM

Current Poll
Do you archery hunt for elk?
YES - 32.42%
83 Votes
NO - 50.00%
128 Votes
Not yet, but I plan to. - 17.58%
45 Votes
Total Votes: 256
You may not vote on this poll.

All times are GMT -5. The time now is 05:50 PM.


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