The Firing Line Forums

Go Back   The Firing Line Forums > The North Corral > Black Powder and Cowboy Action Shooting

Reply
 
Thread Tools
Old November 16, 2012, 03:55 PM   #1
Detonator
Junior Member
 
Join Date: November 14, 2012
Posts: 2
Figuring out the perfect conical size.

Hi I'm new here.

I have to start with a question. Several years ago I bought a custom-made longun. It's a 60 caliber bore. The exact measurements are: .625 and .594 X 36 inches, made with my mechanical micrometer.

.580 balls work with the right patch.

Somebody told me that conicals and minis would need to be a "perfect fit".

Now I have to find out what diameter conical bullets should be for this barrel. I'll no doubt need a custom mold. I'm interested in flat-bottomed conicals at about 600 grains. Is that the same diameter as a mini would need? Since I know next to nothing about BP hardware, I can't even guess at the answers.

Det
Detonator is offline  
Old November 16, 2012, 08:11 PM   #2
arcticap
Senior Member
 
Join Date: March 15, 2005
Location: Central Connecticut
Posts: 2,973
Your long gun barrel seems to have deep rifling grooves.
A custom sizing die can be used to size a wide variety of bullets. And the outfit below can enlarge the size of a die if the diameter proves to be too small. That way the mold doesn't need to be the perfect size.
Lee makes custom sizing dies but has temporarily suspended most custom work because their business is booming.
But there's other outfits that will make them including this one:

http://www.doughtyent.com/Pages/SizingDies.html

A custom mold can also be enlarged to some degree.

http://www.hollowpointmold.com/

Last edited by arcticap; November 17, 2012 at 04:34 AM.
arcticap is offline  
Old November 16, 2012, 08:33 PM   #3
Hawg
Senior Member
 
Join Date: September 8, 2007
Location: Mississippi
Posts: 11,864
A minie needs to be .002 under bore size. A flat based conical needs to be bore size with a little taper to help it get started. Your rifling twist rate will determine how well it shots round balls and conicals.
Hawg is offline  
Old November 18, 2012, 03:21 PM   #4
mykeal
Senior Member
 
Join Date: October 8, 2006
Location: Northern Michigan
Posts: 2,765
Quote:
Originally Posted by Hawg Haggen
Your rifling twist rate will determine how well it shots round balls and conicals.
+1.

You may be on a fruitless mission. Find out the twist rate first.
mykeal is offline  
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -5. The time now is 10:08 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2014 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.06188 seconds with 7 queries