The Firing Line Forums

Go Back   The Firing Line Forums > The Skunkworks > Handloading, Reloading, and Bullet Casting

Thread Tools Search this Thread
Old November 2, 2012, 02:33 PM   #1
Senior Member
Join Date: October 14, 2012
Posts: 413
load data and barrel length.

Hello all. Soon I think I will be loading a 300 rum with retumbo powder. I will be using data from hodgdon. I know hodgdon uses a 24 inch test barrel. My rifle will have a 26 inch heavy weight barrel. Would it be safe to assume that with the extra barrel length. I should at least be close to the data manuals speed?
kilotanker22 is offline  
Old November 2, 2012, 02:50 PM   #2
Join Date: March 4, 2005
Location: Ohio
Posts: 13,814
QuickLOAD thinks that with a 180 grain bullet Retumbo in the large capacity case will add about 66 fps to the 24" barrel data. However, that assumes your chamber and bore are as tight as the test barrel and your freebore is no longer than the test barrel's chamber, none of which is normally true in a mass-produced firearm. So I would not be surprised if your real performance were down around that of the 24" barrel, though occasionally a gun can fool you and go the other way (have a "fast" barrel). So do your load workups while watching for pressure signs.
Gunsite Orange Hat Family Member
CMP Certified GSM Master Instructor
NRA Certified Rifle Instructor
NRA Benefactor Member
Unclenick is offline  
Old November 2, 2012, 03:08 PM   #3
Senior Member
Join Date: October 14, 2012
Posts: 413

I understand the difference in tolerance and free bore. That is why I am assuming like stated earlier I would be very close to published load data.

The only rifle I have ever seen go a little faster is my win model 70 made by fn. It has a chamber tight enough that factory rounds chamber kinda snug.
kilotanker22 is offline  

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 06:33 PM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2017 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent:
Contact Us
Page generated in 0.04564 seconds with 7 queries