The Firing Line Forums

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

Reply
 
Thread Tools
Old February 26, 2001, 09:56 AM   #1
imq707s
Senior Member
 
Join Date: August 31, 2000
Posts: 176
I'm been trying to develope a good accurate load for my Ruger 7mm RM. I choose to use the Hornady 139gr. SST bullets and H-4831 Powder. I started at 64gr increased the amount of powder in 1/2 gr. increments untill I hit a max of 67 gr. I loaded 4 rounds for each amount and started shooting the rounds. I noticed that the groups were really bad, around (1.5-2") until I shot the 66.5 gr. loads and got a 5/8" group. Is it pretty normal to go from 2" groups to 5/8" groups just but changing powder levels? When I shot the 67gr. loads then groups were back around 1.5". Where should I go from here? Should I start playing with seating depths?
imq707s is offline  
Old February 26, 2001, 04:26 PM   #2
sundog
Senior Member
 
Join Date: November 22, 1999
Location: Green Country, OK
Posts: 730
If it were me, and I wanted to make a change, I would back off being near max, make the change and start over.

As far as what's normal, only you can tell from the performance of YOUR rifle. That's why it's so much fun. You get to shoot [ALOT]. sundog
__________________
safety first
sundog is offline  
Old February 26, 2001, 09:52 PM   #3
Brian Harnden
Junior Member
 
Join Date: January 17, 1999
Location: Waco,TX
Posts: 5
7mmRM

Nosler 162gr BT, 64gr H-4813 - NOT IMR 4831!!!
Brian Harnden is offline  
Old February 26, 2001, 11:26 PM   #4
JerryM
Senior Member
 
Join Date: April 4, 1999
Location: New Mexico
Posts: 1,884
Unless you are determined to use the 139 gr bullet, try some different bullets. I haven't checked the max loads, but if 67 gr is the max load for your gun there isn't going to be much velocity difference with 66.5 gr. If that is the most accurate why not use that? I haven't personally found a 1/2 gr powder difference to make that much difference, but it evidently does in your gun. If I got 5/8" groups at 1/2 gr below max I wouldn't try anything else. If you just want to play try different seating depths. Sometimes different powders make a difference. Jerry
JerryM is offline  
Old April 13, 2001, 04:19 PM   #5
freestate
Member
 
Join Date: April 20, 2000
Location: USA
Posts: 35
I'm surprised that nobody has mentioned the obvious and that is, don't draw any conclusions from only one group. You should shoot 5 to 10 groups with a particular load before settling on it. For instance, while working up loads for my .300 Weatherby, I shot a group that measured just slightly over .1" (that's point one, not one). I didn't make that my preferred load, however, because after further testing it just didn't pan out. That outstanding group was simply an anomoly. If you get a good initial group with a particular load, by all means record it, but do further testing with it before drawing any conclusions. Dan
freestate 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 10:27 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 0.06534 seconds with 7 queries