HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: CGSEAL
New Today: 0
New Yesterday: 0
Overall: 12393

People Online:
Members: 0
Visitors: 147
BOT: 4
Total: 151
Who Is Where:
 Visitors:
01: Forums
02: Forums
03: Photo Albums
04: Your Account
05: Forums
06: Forums
07: Forums
08: Photo Albums
09: Forums
10: Forums
11: Photo Albums
12: Forums
13: Forums
14: Forums
15: Photo Albums
16: Forums
17: Forums
18: Forums
19: Forums
20: Photo Albums
21: Forums
22: Forums
23: Photo Albums
24: Forums
25: Forums
26: PointBlank Ballistics
27: Forums
28: Forums
29: Forums
30: Photo Albums
31: Forums
32: Forums
33: Forums
34: Forums
35: Forums
36: Photo Albums
37: Photo Albums
38: Forums
39: Photo Albums
40: Forums
41: Forums
42: Photo Albums
43: Photo Albums
44: Forums
45: Forums
46: Forums
47: Forums
48: Statistics
49: Forums
50: Forums
51: Forums
52: Forums
53: Photo Albums
54: Forums
55: Forums
56: Forums
57: Forums
58: Forums
59: Forums
60: Forums
61: Photo Albums
62: Forums
63: Photo Albums
64: Forums
65: Your Account
66: Forums
67: Forums
68: Forums
69: Your Account
70: Forums
71: Forums
72: Forums
73: Photo Albums
74: Photo Albums
75: Forums
76: Forums
77: Forums
78: Forums
79: Forums
80: Photo Albums
81: Forums
82: Forums
83: Forums
84: Photo Albums
85: Forums
86: Forums
87: Forums
88: Forums
89: Forums
90: Forums
91: Forums
92: Forums
93: Forums
94: Forums
95: Forums
96: Forums
97: Photo Albums
98: Forums
99: Forums
100: Forums
101: Forums
102: Forums
103: Forums
104: Forums
105: Forums
106: Forums
107: Forums
108: Photo Albums
109: Forums
110: Forums
111: Forums
112: Forums
113: Forums
114: Forums
115: Photo Albums
116: Forums
117: Forums
118: Forums
119: Your Account
120: Forums
121: Photo Albums
122: Forums
123: Your Account
124: Forums
125: Forums
126: Photo Albums
127: PointBlank Ballistics
128: Forums
129: Forums
130: Forums
131: Forums
132: Forums
133: Forums
134: Photo Albums
135: Photo Albums
136: Forums
137: Forums
138: Forums
139: Your Account
140: Photo Albums
141: Forums
142: Photo Albums
143: Forums
144: Photo Albums
145: Forums
146: Forums
147: Forums
  BOT:
01: Photo Albums
02: Forums
03: Forums
04: Forums

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 312
 Pictures: 2417
  · Views: 263304
  · Votes: 1281
  · Comments: 86
 

Support our Advertisers

Pressures and components
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Reloading Ammunition

View previous topic :: View next topic  
Author Message
44marty
Super Member
Super Member


Joined: Mar 20, 2009
Posts: 775
Location: Cheshire, MA; USA

PostPosted: Tue Nov 08, 2011 8:27 pm    Post subject: Pressures and components Reply with quote

Here is a posting from the Weatherby website I thought you all might find interesting:

The last series of reloading posts showed the effects of changing temperatures on pressure and velocities. But what happens when you change the other components of a reloaded cartridge? Primers, bullets, or brass. For these purposes we will look at one cartridge (308 Win), with just one load (Xgr IMR4895) and change all the other components. Got it?

Bullet-------------Case----Primer------Velocity--------Pressure (CUP)
168 SierraMK----LC------WLR---------2626-----------52200
168 Speer--------LC------WLR---------2625-----------51200
168 Hornady-----LC------WLR---------2625-----------51200
168 Nosler-------LC-------WLR--------2624-----------52100

All bullets are match type. Brass is Lake City Match. Velocities are quite uniform, and all things considered the pressures are rather uniform. In this particular case, changing bullet brands doesn't seem to make a lot of difference. That isn't always the case. Remember to work back up every time you change bullets or bullet lots if you are working on the edge. Actual working pressures (CUP) for the 7.62Nato is accepted as 50000. Commercial 308 Win loads have a maximum average working pressure of 52000 CUP. Generally the piezo-electric method is used now. 52000CUP is equal to 60000psi in the 308 Win using the piezo method. The pressure gun had a NATO spec chamber in a 308 barrel. This post is not about differences between 7.62 NATO and 308 Win specs, so enough said about that. If you happen to have a European match rifle in 7.62 NATO, be aware that most continental barrels are tight. Many of them are running only a 305 barrel. Next let's change the primers.

Bullet------------Case-----Primer----------Velocity-------Pressure (CUP)
168 MK----------LC-------WLR------------2626----------52200
168 MK----------LC-------Fed 210M------2622----------51000
168 MK----------LC-------Rem 9 1/2------2571----------45500
168 MK----------LC-------CCI 200---------2581---------45500
168 MK----------LC-------CCI 250---------2579---------46100

Not so much difference in velocities. There is more difference with a primer change in velocities than changing bullets made. The big difference is in pressures. Almost 7000CUP in some cases. Notice there wasn't a big difference in pressures by using the CCI 250 (Magnum) primer in this case. Might not be the case with other components or cartridges. The only changes with table 2 was primers. All bullets were Sierra Match King, etc. Are we all on the same page? Now let's change the brass around.

Bullet--------Case----------Primer--------Velocity------Pressure (CUP)
168 MK------LC------------WLR----------2626----------52200
168 MK------FC------------WLR----------2586----------44700
168 MK------WW-----------WLR----------2580----------45300
168 MK------RP------------WLR----------2589----------46400

For reloaders who like to think of the brass case as just a little brass bottle that isn't very important, think again. A couple of years ago I wrote a post about brass and checked out the differences in case capacity and weight. In that post, I mentioned that benchresters often measure their powder charges and only weighed their cases. I caught a lot of grief over that statement, even though it is true. Bear in mind that the Lake City brass is heavier with a smaller internal capacity. Different lots of the same brand brass also varies. The different commercial brass results were fairly close. Depends on whether you want fairly close or not.
Originally I had written down the single load used with all this data, but on second thought decided to call it load X. It was less than a max load according to my old Sierra manual. Listing powder charges still makes me uneasy.

_________________
_____________________________________

The strength of the wolf is in the pack; the strength of the pack is in the wolf. ~ R. Kipling

I LOVE YOU, LADY LUCK !!!
Back to top
View user's profile Photo Gallery
Elvis
Super Member
Super Member


Joined: Jul 27, 2008
Posts: 6778
Location: south island New Zealand

PostPosted: Tue Nov 08, 2011 8:35 pm    Post subject: Re: Pressures and components Reply with quote

now that is food for thought for a sloppy loader like myself. just as well Im well below listed maximums. when I used to chase velocity I would sort brass so Im not completely dence now I just stick to a nice mildish load.

_________________
You shot it You pluck it !
Them who eats the most duck eats the most feathers!
Back to top
View user's profile
slimjim
Super Member
Super Member


Joined: May 16, 2009
Posts: 6868
Location: Fort Worth TX

PostPosted: Tue Nov 08, 2011 9:28 pm    Post subject: Re: Pressures and components Reply with quote

Interesting, I use the brass and primer that resulted in the lowest pressure. Better watch what I change because the only way is up.

_________________
"To anger a conservative, lie to him. To anger a liberal, tell him the truth." - Theodore Roosevelt

"The world is a dangerous place to live; not because of the people who are evil, but because of the people who don't do anything about it." - Albert Einstein
Back to top
View user's profile
MacD
Super Member
Super Member


Joined: Apr 08, 2011
Posts: 1052
Location: Canada

PostPosted: Tue Nov 08, 2011 10:38 pm    Post subject: Re: Pressures and components Reply with quote

That brass has different powder capacities is one point, the other is its relative softness and thickness. I would be interested in knowing if the brass used was new or once fired in the test or another rifle, neck or fl sized. Was it all trimmed to the same length? I assume that the O.A.L. of each cartridge was the same.

In my own weight vs capacity measurements I found that heavier did not always necessarily mean less capacity although this was the general rule.

_________________
La a'Blair s'math n Cairdean
(Friends are good on the day of battle)
Back to top
View user's profile
gelandangan
Super Member
Super Member


Joined: May 07, 2006
Posts: 5659
Location: Sydney Australia

PostPosted: Wed Nov 09, 2011 12:56 am    Post subject: Re: Pressures and components Reply with quote

Well now,
That result of yours is pretty much the same as what I am getting Marty!

When all things are the same,
using Magnum primers somewhat lower the muzzle velocity.

_________________
A straight line is the shortest distance between two points.
A smile is the shortest distance between two people.

The government I trust .. is my .45-70 Government.

Do - Not try!


gelandangan.weebly.com/
Back to top
View user's profile Visit poster's website
SingleShotLover
Super Member
Super Member


Joined: Dec 26, 2007
Posts: 927
Location: Illinois

PostPosted: Wed Nov 09, 2011 6:56 am    Post subject: Re: Pressures and components Reply with quote

It's also a great lesson to remind us to lower our charges when changing any component and gradually work them back up..

_________________
If you can't hit it with one, you probably can't with two either!

The biggest problem with a closed mind is that it never seems to come with a closed mouth.

SSL
Back to top
View user's profile Photo Gallery
Ominivision1
Super Member
Super Member


Joined: Sep 20, 2010
Posts: 2985
Location: Iowa

PostPosted: Wed Nov 09, 2011 7:09 am    Post subject: Re: Pressures and components Reply with quote

Very Interesting.

_________________
Regards

Limitations are but boundaries created inside our minds.
Back to top
View user's profile Photo Gallery
chambered221
Super Member
Super Member


Joined: Aug 17, 2007
Posts: 3437
Location: Lost for good !!!

PostPosted: Wed Nov 09, 2011 8:22 am    Post subject: Re: Pressures and components Reply with quote

It should also be noted that batch to batch differences occur with primers and powders !!!

I don't think it's as much of an issue as it once was but one should still keep it in mind when working with max loads.

_________________
Ask as many people needed, sooner or later your question will be answered the way you want it answered !!!

A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government.
~George Washington
Back to top
View user's profile Photo Gallery
stovepipe
Super Member
Super Member


Joined: Sep 25, 2008
Posts: 4678
Location: Pine, Az.

PostPosted: Wed Nov 09, 2011 10:21 am    Post subject: Re: Pressures and components Reply with quote

SingleShotLover wrote:
It's also a great lesson to remind us to lower our charges when changing any component and gradually work them back up..

Bingo! Very Happy
Back to top
View user's profile
demon00seven
Rookie Member
Rookie Member


Joined: Dec 09, 2011
Posts: 1

PostPosted: Fri Dec 09, 2011 9:09 am    Post subject: Re: Pressures and components Reply with quote

Very informative discussions here, I'm hunter too but not a professional and I love to material related to guns and hunting, very helpful threads and posts here, thanks and love to listen more from you more.
Back to top
View user's profile Visit poster's website
Suzanne
Super Member
Super Member


Joined: Jun 27, 2009
Posts: 3261
Location: Eugene, Oregon

PostPosted: Mon Dec 12, 2011 8:26 am    Post subject: Re: Pressures and components Reply with quote

Demon00 is getting around again.
I love to material too.

_________________
May the moon keep you centered,
May the sun keep you dancing,
And the stars shed light on your dreams.
Back to top
View user's profile
DallanC
Site Admin
Site Admin


Joined: Jan 18, 2005
Posts: 3084
Location: Utah

PostPosted: Mon Dec 12, 2011 11:26 am    Post subject: Re: Pressures and components Reply with quote

Suzanne wrote:
Demon00 is getting around again.
I love to material too.

Ummm not any more he's not Smile


-DallanC
Back to top
View user's profile Photo Gallery
Bushmaster
Super Member
Super Member


Joined: Jun 12, 2005
Posts: 10200
Location: Ava, Missouri

PostPosted: Mon Dec 12, 2011 12:04 pm    Post subject: Re: Pressures and components Reply with quote

Ah rats!! And I wanted one more swing at him...Darn!!

Good Morning Boss...

_________________
I have one nerve left and yer standin' on it...

DEMOCRACY Two wolves and one sheep voting on what to have for lunch...
LIBERTY A well armed sheep contesting the outcome of the vote...
Back to top
View user's profile
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Reloading Ammunition
Page 1 of 1
All times are GMT - 7 Hours



Jump to:  


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum


Advertisements
 


Valid CSS! Valid HTML 4.01!
Click to check if this page is realy HTML 4.01 compliant for speed :)

All logos and trademarks in this site are property of HuntingNut.com.
The comments are property of their posters, all the rest © 2011 by HuntingNut.com
Interactive software released under GNU GPL, Code Credits, Privacy Policy

.: Upgraded to DragonFly 9.2 by Dizfunkshunal :.