HuntingNut
HuntingNut
   Login or Register
HomeCommunity ForumsPhoto AlbumsRegister
     
 

User Info

Welcome Anonymous


Membership:
Latest: kbstenberg
New Today: 1
New Yesterday: 0
Overall: 12394

People Online:
Members: 0
Visitors: 148
BOT: 4
Total: 152
Who Is Where:
 Visitors:
01: Forums
02: Forums
03: Photo Albums
04: Forums
05: Photo Albums
06: Photo Albums
07: Forums
08: Forums
09: Forums
10: Forums
11: Forums
12: Your Account
13: Forums
14: Forums
15: Forums
16: Photo Albums
17: Photo Albums
18: Forums
19: Forums
20: Forums
21: Photo Albums
22: Photo Albums
23: Forums
24: Forums
25: Forums
26: Forums
27: Forums
28: Photo Albums
29: Forums
30: Photo Albums
31: News
32: Forums
33: Photo Albums
34: Home
35: Forums
36: Forums
37: Photo Albums
38: Photo Albums
39: Forums
40: Forums
41: Forums
42: Home
43: Forums
44: Forums
45: Photo Albums
46: Forums
47: Forums
48: Photo Albums
49: News
50: Forums
51: Forums
52: Forums
53: Photo Albums
54: Your Account
55: Photo Albums
56: Forums
57: Photo Albums
58: News
59: Photo Albums
60: Photo Albums
61: Your Account
62: Photo Albums
63: Forums
64: Photo Albums
65: Forums
66: Forums
67: Forums
68: Forums
69: Photo Albums
70: Photo Albums
71: Forums
72: Forums
73: Forums
74: Forums
75: Photo Albums
76: Forums
77: Forums
78: Forums
79: Forums
80: Forums
81: Forums
82: Forums
83: Forums
84: Forums
85: Photo Albums
86: Photo Albums
87: Forums
88: Photo Albums
89: Photo Albums
90: Forums
91: Forums
92: Forums
93: Forums
94: Forums
95: Forums
96: Forums
97: News
98: Forums
99: Forums
100: Forums
101: Forums
102: Photo Albums
103: Forums
104: Forums
105: Forums
106: Photo Albums
107: Photo Albums
108: Forums
109: Photo Albums
110: Forums
111: Photo Albums
112: Forums
113: Photo Albums
114: Photo Albums
115: Forums
116: Forums
117: Forums
118: Forums
119: Photo Albums
120: Photo Albums
121: Forums
122: Photo Albums
123: Forums
124: Photo Albums
125: Forums
126: Forums
127: Photo Albums
128: Forums
129: Forums
130: Forums
131: Forums
132: Your Account
133: Photo Albums
134: Photo Albums
135: Forums
136: Forums
137: Photo Albums
138: Your Account
139: Photo Albums
140: Photo Albums
141: Forums
142: Photo Albums
143: Forums
144: Photo Albums
145: Photo Albums
146: Photo Albums
147: Forums
148: Forums
  BOT:
01: Forums
02: Forums
03: Your Account
04: Forums

Staff Online:

No staff members are online!
 

Coppermine Stats
Photo Albums
 Albums: 312
 Pictures: 2417
  · Views: 263593
  · Votes: 1288
  · Comments: 86
 

Support our Advertisers

Bullet sorting
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
BillPa
Member
Member


Joined: Mar 17, 2005
Posts: 89

PostPosted: Mon Apr 11, 2005 7:18 am    Post subject: Bullet sorting Reply with quote

Previously, there was a discussion on the Stoney Point comparator. Another use is sorting bullets. Its common when seating bullets to find variations in both the LOL and COL lengths. It your trying to get every bit of accuracy out of 'ol Betsy or your favorite varmint rig, sorting bullets may help.
Lets say you want to seat .010" off the lands, so you measure the depth of the chamber with a modified case with your favorite bullet. You take that reading, seat a bullet 10 off and load 100 rounds with that setting. All the same right? Well, mabye not. Two things may affect that measurement. First is the casehead runout and second, the ogive placement on the bullet. All bullets are not created equal even from the most respected makers. Mass produced bullets can vary quite a bit and short of buying only the best quality, like Fowler's,BIBs,etc, the average guy picks up Hornady,Nosler,Sierra and so on. Contrary to what is said, bullets from different machines are (sometimes) mixed in the same box and lot. If one machine is out of adjustment or the dies worn, variations in bullet dimensions will occure. To make the matters worse, setting 10 machines up exactly the same is almost impossible. This may be one of the reasons we get flyers or shoot good groups one day and shotgun patterns the next.
Using the tool to check and sort bullets from the base to ogive may help keeping the shots in one spot.

In the picture below are a group of 6mm bullets from a well known manufacturer,same box, same lot. The variation,from a low of .436" up to one at .445", .007" difference in the bullet bearing surface.
Recently I received 400 68 grain flat based 6mm "Custom" swaged bullets from someone trying to make accurate BR slugs. The base to ogive varied from .351" to .382". I think his process needs a bit more work.
I like experimenting, so most of my seaters have been modified to contact close on the bullet ogive to help eliminate COL lengths due to variations forward of the ogive.

Well, I just wanted to pass this info on. I'm sure some already know this stuff, but for those that didn't, mabye it will be of some help.
By the way, a even more accurate method is to use two comparators for boat tail bullets, one on the ogive and the other on the base.

Bill

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


Joined: Jan 28, 2005
Posts: 317

PostPosted: Mon Apr 11, 2005 10:59 am    Post subject: Re: Bullet sorting Reply with quote

Hello BillPa,

You really hit the nail on the head with that one. Dimensionally all bullets are definitely not the same. I do find most are fairly concentric to the ogive, but the OAL leaves something to be desired. That's always been a problem, even among the custom bullet makers. I'll use custom bullets in .224 and .243 occasionally and all other things being equal they are a cut above, well worth the extra money. Just one mans opinion. Best wishes.

Cal - Montreal
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: Tue Apr 12, 2005 3:40 pm    Post subject: Re: Bullet sorting Reply with quote

Howdy. Good stuff BIll. keep the good info coming Very Happy

_________________
"MOLON LABE"

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


Joined: Apr 05, 2005
Posts: 312
Location: East, Texas

PostPosted: Wed Apr 13, 2005 4:54 pm    Post subject: Re: Bullet sorting Reply with quote

Billpa- Thanks for the info, I had no idea there was that much difference (I'm new to reloading).
Back to top
View user's profile
Laser
Rookie Member
Rookie Member


Joined: Feb 05, 2005
Posts: 6
Location: LAS VEGAS, NV

PostPosted: Wed Apr 13, 2005 5:27 pm    Post subject: Re: Bullet sorting Reply with quote

Thank you foe the info.

_________________
LIFE RMEF, LIFE NRA,LIFE NAHC, RET USN
Back to top
View user's profile Send e-mail AIM Address
calsibley
Super Member
Super Member


Joined: Jan 28, 2005
Posts: 317

PostPosted: Thu Apr 14, 2005 1:56 pm    Post subject: Re: Bullet sorting Reply with quote

I think the only part that's really vital to our accuracy is the length to the ogive. I don't worry much about the overall length too much because anything beyond the ogive is just sitting out there and touching nothing. Just one mans opinion though. Best wishes.

Cal - Montreal
Back to top
View user's profile
calsibley
Super Member
Super Member


Joined: Jan 28, 2005
Posts: 317

PostPosted: Wed Jun 01, 2005 12:56 am    Post subject: Re: Bullet sorting Reply with quote

This is where items like the RCBS Case Mic come into their own. They only measure to the ogive. That's the only important measurement. The actual length of the bullet doesn't mean much in front of the ogive since it just sits out there touching nothing. The Stoney Point OAL guages don't tell us a lot. Much better are some of the ones sold by Sinclair, Hart and others. Really, it doesn't always benefit the reloader to seat out to the lands since some loads prefer to be shorter and have to jump to the lands.
An exact science this area isn't. Best wishes.

Cal - Montreal
Back to top
View user's profile
kbis
Super Member
Super Member


Joined: Apr 05, 2005
Posts: 312
Location: East, Texas

PostPosted: Wed Jun 01, 2005 4:36 pm    Post subject: Re: Bullet sorting Reply with quote

I hate to ask dumb question, but what do you mean by "ogive" Confused ?
Back to top
View user's profile
Blaine
Member
Member


Joined: Feb 24, 2005
Posts: 260
Location: Maine

PostPosted: Wed Jun 01, 2005 8:04 pm    Post subject: Re: Bullet sorting Reply with quote

The ogive is the sloping portion of the bullet that determines where it first touches the rifling. The point it will first touch the rifling is that point where the ogive tapers to the diameter of the bore. That is why the OAL of a cartridge is not as important as the distance from the head space point (the shoulder in a rimless cartridge) to that point on the ogive that will first touch the rifling. As Cal has said....the part of the bullet beyond that contact point just sits in the barrel and makes no difference in bullet seating depth. The bullet could be 1/10 longer than the one before it with no consequence as long as the point on the ogive to the head space point is the same.

_________________
Shoot straight and above all shoot SMART....and remember God is still in control !!!!
Back to top
View user's profile Photo Gallery
Blaine
Member
Member


Joined: Feb 24, 2005
Posts: 260
Location: Maine

PostPosted: Wed Jun 01, 2005 8:20 pm    Post subject: Re: Bullet sorting Reply with quote

If I'm not mistaken, the Lee "dead length" bullet seating die seats the bullet from the point on the ogive described in the previous post. Therefore, as long as you have the die adjusted to the OAL that was determined from your gun, it should seat all the bullets to that point. To find the die adjustment, I take a fired and unsized case, and start a bullet into the neck hand tight. Ink the bullet in good shape (some folks smoke it ), then chamber the round SLOWLY in small fits and starts until the action seats the bullet as it contacts the lands. Then slowly extract the round. If the bullet is in the case, good. If not lightly tap it out from the muzzle end using a suitably sized wooden dowel. Stick it back into the neck to where the ink is rubbed off. Now you have a "dummy round that just touches the rifling. Place the dummy into your press and screw the bullet seating stem down till it just makes contact with the dummy bullet. Remove the round and calculate how much to more to screw the seating stem down (based on what thread pitch you have) to obtain the amount you want off the lands.

Blaine

_________________
Shoot straight and above all shoot SMART....and remember God is still in control !!!!
Back to top
View user's profile Photo Gallery
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 :.