24hourcampfire.com
24hourcampfire.com
Previous Thread
Next Thread
Print Thread
Hop To
Joined: Jan 2019
Posts: 2,145
S
SDHNTR Online Content OP
Campfire Regular
OP Online Content
Campfire Regular
S
Joined: Jan 2019
Posts: 2,145
Say my case length varies by .005 or so. Does that mean my CBTO will too? Or not? I want to say not, as the die is seating to the same spot (in theory) or seating depth regardless of brass length, right?

HR IC

Joined: Nov 2011
Posts: 30,598
A
Campfire 'Bwana
Online Content
Campfire 'Bwana
A
Joined: Nov 2011
Posts: 30,598
Typically not, but if you are worried about it, that's what trimmers are for.


You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell
Joined: Nov 2008
Posts: 8,530
Campfire Outfitter
Online Content
Campfire Outfitter
Joined: Nov 2008
Posts: 8,530
In theory maybe, your base to ogive may change a little to none at all, but if bto doesn’t change then the amount of bullet in the case will. This in turn will change the grip on the bullet. .005 doesn’t sound like a lot but it is. The other kicker is that even bullets from the same lot will have a variance in ogive to base longer or shorter .001-.002 (which I have personally seen up to .003 variance) can exasperate the case length even more.



Swifty
Joined: Feb 2009
Posts: 8,073
Campfire Outfitter
Offline
Campfire Outfitter
Joined: Feb 2009
Posts: 8,073
If you are not turning your necks and anealing. It want matter. Hasbeen


hasbeen
(Better a has been than a never was!)

NRA Patron member
Try to live your life where the preacher doesn't have to lie at your funeral
Joined: Dec 2013
Posts: 12,712
Campfire Outfitter
Online Content
Campfire Outfitter
Joined: Dec 2013
Posts: 12,712
What is CBTO?


Patriotism (and religion) is the last refuge of a scoundrel.

Jesus: "Take heed that no man deceive you."
IC B2

Joined: Dec 2013
Posts: 12,712
Campfire Outfitter
Online Content
Campfire Outfitter
Joined: Dec 2013
Posts: 12,712
Originally Posted by Hastings
What is CBTO?

Never mind, I found out.


Patriotism (and religion) is the last refuge of a scoundrel.

Jesus: "Take heed that no man deceive you."
Joined: May 2018
Posts: 353
B
Campfire Member
Offline
Campfire Member
B
Joined: May 2018
Posts: 353
CBTO will remain consistent but you will have different neck tensions. Will matter if you’re at the bottom edge or top end of charge range. Get a Little Crow Gunworks trimmer for the brass you use most and a manual for the rest. As much 308 as I shoot I couldn’t imagine doing them manually.

Joined: Nov 2011
Posts: 30,598
A
Campfire 'Bwana
Online Content
Campfire 'Bwana
A
Joined: Nov 2011
Posts: 30,598
Originally Posted by hasbeen1945
If you are not turning your necks and anealing. It want matter. Hasbeen


Yep,

And is the runnout controlled?

Much bigger worries before one get's to this.


You didn't use logic or reason to get into this opinion, I cannot use logic or reason to get you out of it.

You cannot over estimate the unimportance of nearly everything. John Maxwell
Joined: Nov 2008
Posts: 8,530
Campfire Outfitter
Online Content
Campfire Outfitter
Joined: Nov 2008
Posts: 8,530
Originally Posted by bluejay75
CBTO will remain consistent but you will have different neck tensions. Will matter if you’re at the bottom edge or top end of charge range. Get a Little Crow Gunworks trimmer for the brass you use most and a manual for the rest. As much 308 as I shoot I couldn’t imagine doing them manually.


Actually variance in neck tension can and does cause variances in seating depth or CBTO. Another thing that can throw you off is if the primer pockets are not uniform you can get a misreading CBTO by having a primer sticking out a thou or 2.



Swifty
Joined: Apr 2003
Posts: 6,819
Campfire Tracker
Online Content
Campfire Tracker
Joined: Apr 2003
Posts: 6,819
What is CBTO?

IC B3

Joined: Nov 2008
Posts: 8,530
Campfire Outfitter
Online Content
Campfire Outfitter
Joined: Nov 2008
Posts: 8,530
Originally Posted by southtexas
What is CBTO?


Cartridge base to ogive



Swifty
Joined: Apr 2003
Posts: 6,819
Campfire Tracker
Online Content
Campfire Tracker
Joined: Apr 2003
Posts: 6,819
thank you!


Moderated by  RickBin 

Link Copied to Clipboard
YB23

Who's Online Now
644 members (007FJ, 01Foreman400, 222ND, 160user, 1234, 1lessdog, 68 invisible), 2,806 guests, and 1,387 robots.
Key: Admin, Global Mod, Mod
Forum Statistics
Forums81
Topics1,187,655
Posts18,399,237
Members73,817
Most Online11,491
Jul 7th, 2023


 







Fish & Game Departments | Solunar Tables | Mission Statement | Privacy Policy | Contact Us | DMCA
Hunting | Fishing | Camping | Backpacking | Reloading | Campfire Forums | Gear Shop
Copyright © 2000-2024 24hourcampfire.com, Inc. All Rights Reserved.
Powered by UBB.threads™ PHP Forum Software 7.7.5
(Release build 20201027)
Responsive Width:

PHP: 7.3.33 Page Time: 0.107s Queries: 14 (0.004s) Memory: 0.8431 MB (Peak: 0.9326 MB) Data Comp: Zlib Server Time: 2024-03-28 18:55:51 UTC
Valid HTML 5 and Valid CSS