« previous next »
Pages: [1]   Go Down

Author Topic: Loads higher than manual claims  (Read 691 times)

0 Members and 1 Guest are viewing this topic.

Offline Sourdough

  • Trade Count: (1)
  • Senior Member
  • *****
  • Posts: 8150
  • Gender: Male
Loads higher than manual claims
« on: September 12, 2011, 08:20:54 PM »
Went to the range today, with my Weatherby 338-378.  I have been loading 99grs of IMR-7828, pushing a Nosler 250gr Partition.  Nosler 6 reloading manual says I should be getting 2976fps. 

I took my Chrony to the range and checked my velocity.  3040fps is the average I got out of five shots fired, with a + or - 2fps spread.  I was a bit surprised by the results being higher than Nosler said they would be.
Logged
Where is old Joe when we really need him?  Alaska Independence    Calling Illegal Immigrants "Undocumented Aliens" is like calling Drug Dealers "Unlicensed Pharmacists"
What Is A Veteran?
A 'Veteran' -- whether active duty, discharged, retired, or reserve -- is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America,' for an amount of 'up to, and including his life.' That is honor, and there are way too many people in this country today who no longer understand that fact.

Offline necchi

  • GBO Supporter
  • Trade Count: (40)
  • Senior Member
  • *****
  • Posts: 1842
  • Gender: Male
Re: Loads higher than manual claims
« Reply #1 on: September 12, 2011, 08:41:02 PM »
Simple,
 Your jug of powder is better than theirs,,  :o   ;D
Logged
found elsewhere

Offline Land_Owner

  • Global Moderator
  • Moderators
  • Trade Count: (31)
  • Senior Member
  • *****
  • Posts: 4543
    • Permission Granted - Land Owner
Re: Loads higher than manual claims
« Reply #2 on: September 12, 2011, 11:02:48 PM »
Tighter bore, longer barrel, higher altitude, lower barametric pressure, different temperature, and planets aligned.   ;D
Logged

Offline BBF

  • GBO Supporter
  • Trade Count: (0)
  • Senior Member
  • *****
  • Posts: 10042
  • Gender: Male
  • I feel much better now knowing it will get worse.
Re: Loads higher than manual claims
« Reply #3 on: September 13, 2011, 06:17:33 AM »
They probably have a different Chrony as well ;) ;)
Logged
What is the point of Life if you can't have fun.

Offline Savage

  • Trade Count: (0)
  • Senior Member
  • *****
  • Posts: 4397
Re: Loads higher than manual claims
« Reply #4 on: September 13, 2011, 07:05:53 AM »
Higher velocity comes at the expense of higher pressure. I'd reduce that load.
Savage
Logged
An appeaser is one who feeds the crocodile hoping it will eat him last,

Offline Old Syko

  • Trade Count: (1)
  • Senior Member
  • *****
  • Posts: 2263
  • Gender: Male
Re: Loads higher than manual claims
« Reply #5 on: September 13, 2011, 08:30:55 AM »
It's just like we always try to explain to the guys new to reloading.  These manuals are a guideline only.  As has been said, there are many variables all the way down to differences in test equipment and weather.  If this is a load you've been using and you feel comfortable with it, there's no reason to change.  If on the other hand, you feel you're pushing the envelope, then change it. But that manual is still nothing but a guideline.
Logged

Offline SHOOTALL

  • Trade Count: (0)
  • Senior Member
  • *****
  • Posts: 23836
Re: Loads higher than manual claims
« Reply #6 on: September 13, 2011, 09:21:03 AM »
maybe your bbl was longer or tighter or smoother , along with all other options mentioned . Hey crimp or no crimp ?
Logged
If ya can see it ya can hit it !

Offline Sourdough

  • Trade Count: (1)
  • Senior Member
  • *****
  • Posts: 8150
  • Gender: Male
Re: Loads higher than manual claims
« Reply #7 on: September 13, 2011, 01:21:45 PM »
No crimp.  I've been shooting this load for a couple of years.  No high pressure signs, and is a full grain lower than what I used to shoot.  Other load showed no pressure signs as well, but was not as accurate as I wanted.  Dropping one full grain tightened the group up.  I have a six and three quarters inch group, down to three and a quarter inch group at 400 yards.  This is the load I used for the Grizzly two years ago.  I had just never shot through the Chrony before. 

The reason I wanted to use the Chrony was, my shots were flatter in the 100 and 150 yard range, than the ballistics table said they should be.  Also they were higher out at 600 and 700 yards than they were supposed to be, according to the ballistics table.  I just got a ballistics program for my computer and decided to compare all my factors.  I am happy with my results, and plesently surprised.

The Weatherby has a 26" barrel, with a 2" brake. 
Logged
Where is old Joe when we really need him?  Alaska Independence    Calling Illegal Immigrants "Undocumented Aliens" is like calling Drug Dealers "Unlicensed Pharmacists"
What Is A Veteran?
A 'Veteran' -- whether active duty, discharged, retired, or reserve -- is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America,' for an amount of 'up to, and including his life.' That is honor, and there are way too many people in this country today who no longer understand that fact.

Offline Austin from NC

  • Racjarrett88
  • Trade Count: (12)
  • Contributor
  • ***
  • Posts: 410
  • Gender: Male
  • Proudest Uncle Ever
Re: Loads higher than manual claims
« Reply #8 on: September 13, 2011, 03:04:40 PM »
I bet a pound of powder doesn't last long does it?

       Austin
Logged
(choot it, choot it Elizabeth, choot it) Troy Landry

Offline LONGTOM

  • Trade Count: (391)
  • Senior Member
  • *****
  • Posts: 4644
  • Gender: Male
  • IF ONLY I COULD GO BACK-I WOULD BE A MOUNTAIN MAN!
Re: Loads higher than manual claims
« Reply #9 on: September 13, 2011, 04:05:20 PM »
Quote from: Austin from NC on September 13, 2011, 03:04:40 PM
I bet a pound of powder doesn't last long does it?

       Austin

Should figure out to about 70 rounds to the pound!
 
 
 
LONGTOM
Logged
NRA Benefactor Life Member
NAHC Life Member
NRA Member-JAMES MADISON BRIGADE
IWLA Member
NRA/ILA Member
CCRKBA Member
US OLIMPIC SHOOTING TEAM supporter

"THE TREE OF LIBERTY FROM TIME TO TIME MUST BE REFRESHED WITH THE BLOOD OF PATRIOTS AND TYRANTS".
THOMAS JEFFERSON

That my two young sons may never have to know the horrors of war. 

I will stand for your rights as my forefathers did before me!
My thanks to those who have, are and will stand for mine!
To those in the military, I salute you!

LONGTOM 9-25-07

Offline Sourdough

  • Trade Count: (1)
  • Senior Member
  • *****
  • Posts: 8150
  • Gender: Male
Re: Loads higher than manual claims
« Reply #10 on: September 14, 2011, 08:27:14 AM »
Three boxes of shells and it's time for another container of powder.  I now buy the larger containers, I think it is 8 pounds. 
Logged
Where is old Joe when we really need him?  Alaska Independence    Calling Illegal Immigrants "Undocumented Aliens" is like calling Drug Dealers "Unlicensed Pharmacists"
What Is A Veteran?
A 'Veteran' -- whether active duty, discharged, retired, or reserve -- is someone who, at one point in his life, wrote a blank check made payable to 'The United States of America,' for an amount of 'up to, and including his life.' That is honor, and there are way too many people in this country today who no longer understand that fact.

Offline fast*eddie

  • Trade Count: (1)
  • Avid Poster
  • **
  • Posts: 218
  • Gender: Male
Re: Loads higher than manual claims
« Reply #11 on: September 19, 2011, 03:47:24 AM »
Uhhhhhhh , maybe you had a good Tail-wind !  ;)
Logged
Semper Fi !

Offline anachronism

  • Trade Count: (0)
  • Contributor
  • ***
  • Posts: 269
Re: Loads higher than manual claims
« Reply #12 on: September 19, 2011, 03:27:38 PM »
That's what, 64 FPS from a 3000 FPS load? That's about 2% difference. Standard deviation is sometimes higher than that. Factory loading data is not an oracle, there will always be some sort of difference. As long as everything else appears to be in line, enjoy it. You could have even had your chronograph a foot or two closer than they did.
Logged

Offline Lloyd Smale

  • Moderators
  • Trade Count: (32)
  • Senior Member
  • *****
  • Posts: 18273
Re: Loads higher than manual claims
« Reply #13 on: September 20, 2011, 03:14:51 AM »
my first two chronagraphs were the cheap chronys. I allways thought my velocitys were a bit high. When compared to my buddys ohler the chronys read between 100 and 200 fps faster. I bought a good pact and found that it read about identical to my buddys ohler.
Quote from: scatterbrain on September 13, 2011, 06:17:33 AM
They probably have a different Chrony as well ;) ;)
Logged
blue lives matter

Offline drdougrx

  • GBO Supporter
  • Trade Count: (10)
  • Senior Member
  • *****
  • Posts: 3212
Re: Loads higher than manual claims
« Reply #14 on: September 20, 2011, 05:03:15 AM »
My Oehler Chronograph is the bane of my existence......
Logged
If you like, please enjoy some of my hunt pics at:

http://public.fotki.com/DrDougRx

If you leave a comment, please leave your GB screen name so that I can reply back!
Pages: [1]   Go Up
« previous next »