HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: reklawgb
New Today: 0
New Yesterday: 0
Overall: 12457

People Online:
Members: 0
Visitors: 73
BOT: 4
Total: 77
Who Is Where:
 Visitors:
01: Forums
02: Forums
03: Forums
04: Forums
05: Forums
06: Photo Albums
07: Home
08: Forums
09: Forums
10: Forums
11: Forums
12: Forums
13: Forums
14: Forums
15: Forums
16: Home
17: Forums
18: Forums
19: Forums
20: Forums
21: Forums
22: Forums
23: Forums
24: Forums
25: Forums
26: Your Account
27: Forums
28: Forums
29: Forums
30: Forums
31: Forums
32: Forums
33: Forums
34: News
35: Forums
36: Forums
37: Forums
38: Forums
39: Forums
40: Forums
41: Forums
42: Forums
43: Your Account
44: Forums
45: Photo Albums
46: Forums
47: Forums
48: Forums
49: Forums
50: Forums
51: Photo Albums
52: Forums
53: Forums
54: Forums
55: Forums
56: Forums
57: Forums
58: Forums
59: Forums
60: Forums
61: Forums
62: Forums
63: Forums
64: Forums
65: Forums
66: Forums
67: Home
68: Forums
69: News
70: Forums
71: Forums
72: Forums
73: Forums
  BOT:
01: Forums
02: Your Account
03: Forums
04: Forums

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 303
 Pictures: 2374
  · Views: 295714
  · Votes: 1301
  · Comments: 86
 

Support our Advertisers

Bullet jump
Discussions related to Guns and Firearms

View previous topic :: View next topic  
Author Message
Sabertooth
Rookie Member
Rookie Member


Joined: Jun 11, 2011
Posts: 2
Location: Grants Pass, Oregon

PostPosted: Sat Jun 11, 2011 10:17 am    Post subject: Bullet jump Reply with quote

4 different 30-06 rifles. 2 factory rifles and 2 customs. Bullet jump difference.
The case OL in the custom rifles are so long that the case overall is longer then the magazine. The 2 factroy rifles the case OL barley fits in the magazine. Using 168gr boat tail bullets.
So the question is what is the correct bullet jump distance for a 30-06?
Case over all length?
Just because you've been reloading for 40 years does not mean you asked all the questions. Confused Confused
Back to top
View user's profile
shrpshtrjoe
Super Red Neck Member
Super Red Neck Member


Joined: Jan 26, 2005
Posts: 2955
Location: Maryland

PostPosted: Sat Jun 11, 2011 10:55 am    Post subject: Re: Bullet jump Reply with quote

Welcome to the HuntingNut Howdy Accuracy will be effected by seating depth. You may find one oal that functions well and gives acceptable accuracy in your four rifles but if you experiment and vary it in each rifle you will probably find each rifle has a depth it likes best..

Joe

_________________
"MOLON LABE"

P E T A
People Eating Tasty Animals
Back to top
View user's profile Photo Gallery
Ominivision1
Super Member
Super Member


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

PostPosted: Sat Jun 11, 2011 11:23 am    Post subject: Re: Bullet jump Reply with quote

Welcome Sabertooth, I owned at one time 3 different /06 rifles from different manufactures and in each case, the rifles had their own identity. No rifle whether factory or custom made is the same, I think its like human dna. When I reload for any of my rifles, I always make a dummy round and check chamber specs.

I take an empty /06 and loosely put a bullet in the case and chamber it, when pulling the case out, I can then measure chamber specs for that particular gun. What I do is once chamber specs are known and written down for that rifle, I will then back off 0.050 for starting loads and gradually work closer towards the lands as accuracy improves.

Each rifle from then on had their own load specs.

_________________
Regards

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


Joined: May 07, 2006
Posts: 5721
Location: Sydney Australia

PostPosted: Sat Jun 11, 2011 3:30 pm    Post subject: Re: Bullet jump Reply with quote

Gday Sabertooth!

Welcome!

I have been shooting wildcat for a few years, where almost all the aspect of reloading are trial and error.

I have not figured it all out yet, and I might be wrong,
but I feel that the bullet jump factor is a function of the burning speed of the powder and the hardness of the projectile (jacket),
and the size and depth of barrel lands and grooves..

With the faster burning powder, you would have to reduce the chamber pressure early at the detonation of the charge.
This is achieved by increasing the detonation chamber (by moving the projectile out) as soon as possible.
Having the bullet jammed to the groove will significantly increase the drag of the projectile,
thus leaving a "jump" space would let to better distribution of pressure curve, and ultimately lends to a better accuracy.

The other end of the theory, which is in contradiction from the above Razz
Is that the energy required to engrave the projectile onto the rifling is very high.
On slower burning powder, this energy pressure came slow,
thus for projectile that sit away from the groves have enough acceleration to carry over the engraving smoothly.
And again, ultimately lends to a better accuracy.

Pardon me to ramble. But thats what I thought.

_________________
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
English Mike
Super Member
Super Member


Joined: Jan 08, 2007
Posts: 1133
Location: Whitehaven, Cumbria, UK

PostPosted: Sat Jun 11, 2011 4:52 pm    Post subject: Re: Bullet jump Reply with quote

Bullet jump is one of the lesser factors viz firearms accuracy, so unless you're punching paper off a bench rest, it often has little effect on the end result - except with Barnes copper bullets, which in general like to be seated away from the lands.
Remember you need to seat the bullet into the case by at least one caliber for reliability.
Back to top
View user's profile
Elvis
Super Member
Super Member


Joined: Jul 27, 2008
Posts: 6980
Location: south island New Zealand

PostPosted: Sat Jun 11, 2011 5:53 pm    Post subject: Re: Bullet jump Reply with quote

I dont measure my bullet jump at all. if it fits in the magazine and will chamber with no dramas its good enough for me. I use a factory load or a reload that I know works fine for setting the dies try the first in rifle then load the rest. as English Mike says if you arent punching paper and trying for that last mm of group size dont sweat it too much.

_________________
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: 7090
Location: Fort Worth TX

PostPosted: Sat Jun 11, 2011 6:22 pm    Post subject: Re: Bullet jump Reply with quote

I have found that consistent bullet jump is important to accuracy, but the amount of bullet jump that provides the best accuracy and smallest groups is unique for each rifle. I've read recent accounts that the optimum distance off the lands can be much further than expected. Barnes bullets like being further off the lands than other bullets. I've loaded as far as 0.200" off the land with good results. All my current loads are between 0.010 and 0.100. You just have to try different distances. If you can't find a common overall length that works in all your .30-06s, you might load all your bullets to the longest length you need then reseat the bullets further when you need them based on the rifle that you will use them in. Here is another post that talks about bullet jump.

www.huntingnut.com/ind...73&start=0

_________________
"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
Sabertooth
Rookie Member
Rookie Member


Joined: Jun 11, 2011
Posts: 2
Location: Grants Pass, Oregon

PostPosted: Sun Jun 12, 2011 12:07 am    Post subject: Re: Bullet jump Reply with quote

Thanks for the reply's and jogging my brain cells loose. One 06 is target only. We call it The Beast, just under 20 pounds. 28 inch barrel. The others are hunting rifles with 24 inch barrels.
Back to top
View user's profile
Elvis
Super Member
Super Member


Joined: Jul 27, 2008
Posts: 6980
Location: south island New Zealand

PostPosted: Sun Jun 12, 2011 12:40 am    Post subject: Re: Bullet jump Reply with quote

I guess when you go hunting then its eany meany mino mo .
my big bro has 2 .308s and the ammo thats great for 1 will do the job in the other. bullets seated out to be close to the rifling for 1 will not go in the magazine of the other. so they get seated out to magazine length and used in both. I have two loads for my rifle a old model 70 .270 one is a great accurate 130grn load and the other a 170grn bush load. I guess you could sort out your favourite rifles pet seating depth and the other rifles would just have to lump it. or have a super duper load for those longer shots and a near enough load for anything else. with your 30/06 and a deer sized beasty near enough would be good enough at normal ranges anywaythats a fine deer cartridge.

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


Joined: May 25, 2005
Posts: 13069
Location: Brisbane AUSTRALIA

PostPosted: Sun Jun 12, 2011 5:04 am    Post subject: Re: Bullet jump Reply with quote

Welcome aboard Sabertooth...grab a beer and pull up a stump mate.

Seeing as how your '06 is solely for paper punching, the first step should be consideration of what sort of "paper punching" you intends doing. If it is everyday "fun" target shooting, then pretty much any of the standard die manufacturers products will be suitable.

From the description of your rifle, I get the impression that it is most likely a Bench Rest rifle, so you need to look at what sort of reloading dies that are most suited to that style of shooting.

There are specialised dies that are available for Bench Rest reloading that allow you to finely tune the reloading process. When you start handloading for Bench Rest you have a long road in front of you as far as load development is concerned. I would recommend you also look at a Forum targeted specifically at Bench Rest shooting if this is the discipline you intend shooting.

Whichever way you choose to go mate, there is a wealth of information and knowledge available from the guys here. Let us know how it all goes ,ate.

Cheers, Vince

_________________
Cheers, Vince Cheers

Illegitimi non carborundum
(Never let the bastards grind you down)

Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God.

"Nulla Si Fa Senza Volonta."
(Without Commitment, Nothing Gets Done)
Back to top
View user's profile AIM Address MSN Messenger Yahoo Messenger Photo Gallery
bracer
Member
Member


Joined: Dec 24, 2009
Posts: 46
Location: Prairie Dog Country

PostPosted: Mon Jun 13, 2011 5:23 am    Post subject: Re: Bullet jump Reply with quote

Most all of my shooting is at prairie dogs. I wont the the most accurate loads for shooting the little critters. The Stoney Point-Hornady O.A.L. w/modified cases guage to measure bullet free bore, The Bullet Comparator Comparator w/caliber inserts to seat the bullets, and the Headspace Guage Tool w/ bushing when full size resizing case are some of my reloading tools. The amount of bullet jump from the case to the rifleing is an key measurement in finding an accurate reload. When I miss a shot I wont to know that it was my shooting, not the ammo, rifle, or scope.

_________________
tuck2
Back to top
View user's profile
Display posts from previous:   
Post new topic   Reply to topic   Printer Friendly Page    Forum Index » Gun & Firearm Discussions
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 :.