The Firing Line Forums

Go Back   The Firing Line Forums > The Hide > The Art of the Rifle: Bolt, Lever, and Pump Action

Reply
 
Thread Tools Search this Thread
Old October 12, 2015, 11:47 PM   #1
DesertRatR
Junior Member
 
Join Date: October 11, 2015
Location: Southern Arizona
Posts: 10
Too light of a load?

I am just learning to load 45 colt. I loaded up a bunch with Unique (intentional light load I shoot in my SA revolver) and shot them out of my Henry Bigboy. Bullet was 250 gr 0.452" dia, OAL was 1.600", which is right at the upper spec limit. They chronographed at 935 ft/sec with SD of 34. I shoot left handed, and occasionally felt a little gas out of the ejection port. The cases were pretty scorched. Will increasing the load take care of the gas leakage? What is a good target MV to aim for? I was futzing with Miller's stability formula, and the Sg is about 2, at MV-934 ft/sec and the Henry's slow twist of 38".

Thanks for helping a rank amateur.
DesertRatR is offline  
Old October 13, 2015, 01:12 AM   #2
Pathfinder45
Senior Member
 
Join Date: January 7, 2008
Posts: 1,729
That muzzle velocity is near perfect for Unique in a revolver, but you should be getting a little more in a rifle. What's the charge weight and primer?

Last edited by Pathfinder45; October 13, 2015 at 02:53 AM. Reason: Insert,"for".
Pathfinder45 is offline  
Old October 13, 2015, 12:16 PM   #3
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 6,488
935 ft/sec sounds like about an 8.5 to 9 grain load out of a 5.5" barrel. 9.5 being max for a cast 250 with Unique, according to Alliant. So you really don't have a lot of wiggle room. You work up to whatever it actually is, or just pick it?
Like Pathfinder45 says, you should be getting more velocity out of the longer barrel. Barrel length has more to do with it than the twist. However, the chances of finding a load both your rifle and revolver will shoot well and not be too heavy are really kind of slim.
And forget formulas. They don't work.
__________________
Spelling and grammar count!
T. O'Heir is offline  
Old October 13, 2015, 04:37 PM   #4
Snyper
Senior Member
 
Join Date: December 16, 2013
Location: Eastern NC
Posts: 2,609
If there's a lot of soot on the cases, that is an indication the loads need to be hotter to make the cases seal the chamber
__________________
One shot, one kill
Snyper is offline  
Old October 13, 2015, 10:32 PM   #5
DesertRatR
Junior Member
 
Join Date: October 11, 2015
Location: Southern Arizona
Posts: 10
Some place I read not to post powder weight used. Thoughts?
DesertRatR is offline  
Old October 14, 2015, 10:25 AM   #6
Ifishsum
Senior Member
 
Join Date: September 15, 2005
Location: Oregon
Posts: 912
Quote:
Some place I read not to post powder weight used. Thoughts?
It's done all the time. Any charge weights outside the normal load data range (hot loads) are supposed to be prefaced with a stern and specific warning though.
Ifishsum is offline  
Old October 14, 2015, 11:51 AM   #7
T. O'Heir
Senior Member
 
Join Date: February 13, 2002
Location: Canada
Posts: 6,488
It's don't use somebody else's load without checking it in a manual.
Posting the actual load you're using provides a lot of info. Like if the load is safe. Too low can be as dangerous as too high.
Any charge weights outside the normal load data range (hot loads) are usually unsafe.
__________________
Spelling and grammar count!
T. O'Heir is offline  
Old October 14, 2015, 12:41 PM   #8
Slamfire
Senior Member
 
Join Date: May 27, 2007
Posts: 4,808
Quote:
I am just learning to load 45 colt. I loaded up a bunch with Unique (intentional light load I shoot in my SA revolver) and shot them out of my Henry Bigboy. Bullet was 250 gr 0.452" dia, OAL was 1.600", which is right at the upper spec limit. They chronographed at 935 ft/sec with SD of 34. I shoot left handed, and occasionally felt a little gas out of the ejection port. The cases were pretty scorched. Will increasing the load take care of the gas leakage? What is a good target MV to aim for? I was futzing with Miller's stability formula, and the Sg is about 2, at MV-934 ft/sec and the Henry's slow twist of 38".

Just how much Unique were you using?
__________________
If I'm not shooting, I'm reloading.
Slamfire is offline  
Old October 14, 2015, 10:35 PM   #9
Pathfinder45
Senior Member
 
Join Date: January 7, 2008
Posts: 1,729
Those of us that use Unique in 45 Colt can pretty much guess that it's a light load. But we would like to hear from DesertRatR himself before we recommend more fuel.
Pathfinder45 is offline  
Old October 16, 2015, 07:31 AM   #10
DesertRatR
Junior Member
 
Join Date: October 11, 2015
Location: Southern Arizona
Posts: 10
The load I was shooting was 7.2 gr Unique. In my SA with 7" barrel (Blackhawk) I get about 850 fps or so. I like light loads so as to not beat up my gun. A buddy who does cowboy action shooting loads his with 7.0 gr Unique.

I wanted to see how the light load would do in the rifle, since I'd been shooting factory ammo in that. I think I got my answer. I have loaded up some 8.0 gr and 8.2 gr Unique (manual has 8.5 as max) and will chronograph those today. I'll report back.

BTW, the factory ammo I have is 250 gr jacketed. No powder data available for that. My handloads are 250 gr lead RNFP.

Last edited by DesertRatR; October 16, 2015 at 03:36 PM.
DesertRatR is offline  
Old October 16, 2015, 03:47 PM   #11
DesertRatR
Junior Member
 
Join Date: October 11, 2015
Location: Southern Arizona
Posts: 10
I chronographed three loads today (Chrony Beta set up 10 feet in front of bench)
1) 30 rounds 250 gr LRNFP (HSM) with 8.0 gr Unique. OAL 1.58"
2) 30 rounds 250 gr LRNFP (HSM) with 8.2 gr Unique. OAL 1.58"
3) 30 rounds 250 gr factory ammo TMJ (HPR), unknown powder (Mfr did tell me they load to 12-13k psi).

My manual lists 8.5 gr Unique as upper limit for rifle loads.

Results:
1) 8.0 gr Unique; average speed 1046.3 fps stdev 46.9 fps. Cases still badly scorched.
2) 8.2 gr Unique; average speed 1085.3 fps stdev 45.8 fps. Cases still badly scorched.
3) Factory ammo; average speed 933.4 fps stdev=27.7 fps. Cases badly scorched.

My powder throw came with my RCBS Rockchucker. When I have checked it the dispensed weight is extremely accurate, within 0.1 grain, which is scale resolution. So why the big sigma? And why are the cases still scorched? I also felt the occasional gas out of the ejection port on my right arm (I shoot left handed). So the increased load doesn't seem to be doing what I expected.

The factory ammo produced scorched cases, and I felt a little gas also. Thoughts there?

Some rifle defect? I've only shot maybe 500 rounds thru it, most of it factory ammo.
DesertRatR is offline  
Old October 24, 2015, 09:58 AM   #12
myg30
Member
 
Join Date: January 20, 2009
Location: Middle TN.
Posts: 47
You might have a slightly over sized chamber, but if your cases are not splitting, and you accuracy is good then carry on.
You can always have the chamber measured by gun smith or do a chamber casting ( google it) yourself and mic the casting.
I have same case blackening on a couple of pistols and has not caused case cracking and the carbon cleans off in the tumbler.

If you want to call Henry and express your concern of hot gas on your arm, just don't mention the cuss word RELOAD ! I've never delt with their cust service but you might be without your rifle a while.

Good luck n be safe

Mike
myg30 is offline  
Old October 24, 2015, 10:10 AM   #13
mehavey
Senior Member
 
Join Date: June 17, 2010
Location: Virginia
Posts: 4,361
Out of curiosity, what are the mouth diameters of your fired cases ?
mehavey is offline  
Old November 7, 2015, 02:37 PM   #14
DesertRatR
Junior Member
 
Join Date: October 11, 2015
Location: Southern Arizona
Posts: 10
Fired case OD 0.472 to 0.473
DesertRatR is offline  
Reply

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 09:54 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2016, vBulletin Solutions, Inc.
This site and contents, including all posts, Copyright © 1998-2016 S.W.A.T. Magazine
Copyright Complaints: Please direct DMCA Takedown Notices to the registered agent: thefiringline.com
Contact Us
Page generated in 0.14099 seconds with 9 queries