Go Back   CMP Forums > CMP General > Ask Each Other > Reloading
Register FAQ Members List Calendar Mark Forums Read

Reply
 
Thread Tools Display Modes
  #1  
Old 04-03-2018, 08:45 AM
pinholeshoot pinholeshoot is offline
Banned
 
Join Date: Aug 2017
Location: tx
Posts: 108
Default .308 Hornady load data

Hornady lists a maximum charge of 43.2 grains of IMR4064 in their 308 service rifle section for a 150 grain bullet at 2700 fps velocity. And that is with commercial cases and regular primers.

Using the search function, I've found where it has been posted several times here in the past of NRA data giving a charge range of 42-44 grains of IMR4064 using GI Lake City cases.

The NRA data would seem to be high to me compared to Hornady since Hornady max is 43.2 with a commercial case. I've always read that you have to drop a grain of powder when using mil-spec cases, so that would drop the Hornady value down to 42.2 grains of IMR4064. Supposedly it would drop even a little more if using a primer such as CCI#34.

So anyway, I'm a little confused and would appreciate any insight others have to offer. I'm trying to work up the following load and don't want to overdo it:

150 grain bullet
CCI#34 primer
IMR4064 powder
LC cases
2700 fps velocity

So what would/should be the max charge? Is 43.0, 43.5, 44.0 grade of IMR 4064 too much?
Reply With Quote
  #2  
Old 04-03-2018, 10:01 AM
tinplater611 tinplater611 is offline
 
Join Date: Sep 2016
Location: Columbus, OH
Posts: 214
Default

Both Hodgdon's load data (on their site) and the Lee's Modern Reloading 2nd edition list 43gr as the starting load for IMR4064 for 308 WIN with 150gr bullets and 47.7gr as the max load. Lyman lists 43gr-48gr as the range for IMR4064 with 150gr .308.

They don't list service rifle data, but you can simply reduce the load by 1-2gr as Hornady seems to do. I have noticed that Hornady seems to be consistently lower than all other reloading data, probably a liability CYA issue.

Last edited by tinplater611; 04-03-2018 at 10:09 AM.
Reply With Quote
  #3  
Old 04-03-2018, 12:37 PM
GM1MAN GM1MAN is offline
 
Join Date: Oct 2014
Posts: 1,101
Default

The best way is to work up your load in increments and find the one that is most accurate in your rifle without exhibiting signs of high pressure. You might very well reach that 2700 fps. mark at around 43.2 grains of IMR 4064, but you should do so slowly.

IMHO, each rifle is different, but high velocity and maximum powder charges do not always mean high accuracy.

I have no problems with either the Hornady or Lyman manuals, but I stay conservative when I am loading for Service Rifles. I just do not see the need to use maximum loads in my semi-auto rifles.

Last edited by GM1MAN; 04-03-2018 at 12:40 PM.
Reply With Quote
  #4  
Old 04-03-2018, 02:38 PM
rcolarco rcolarco is offline
 
Join Date: Oct 2009
Location: Oblong state west of the Mississippi River
Posts: 4,115
Default

Quote:
Originally Posted by GM1MAN View Post
The best way is to work up your load in increments and find the one that is most accurate in your rifle without exhibiting signs of high pressure. You might very well reach that 2700 fps. mark at around 43.2 grains of IMR 4064, but you should do so slowly.

IMHO, each rifle is different, but high velocity and maximum powder charges do not always mean high accuracy.

I have no problems with either the Hornady or Lyman manuals, but I stay conservative when I am loading for Service Rifles. I just do not see the need to use maximum loads in my semi-auto rifles.
You won't see any signs of high pressure until you are well above a reasonable service rifle load. High port pressure will come in long before high chamber pressure manifests itself through case inspection. I never load more than 42 grains of anything for a gas gun, and my ammo does fine at 600.
__________________
NRA-certified rifle (40 years), pistol, home firearms safety, and personal protection instructor
NRA-certified range safety officer
North Dakota-certified hunter safety instructor
ACEP-certified coach
Satisfied shooter of low-number Springfields
Not on the payroll of any arms or ammunition companies
Reply With Quote
  #5  
Old 04-03-2018, 03:14 PM
fartblossom1953 fartblossom1953 is offline
 
Join Date: Oct 2009
Location: Newport N.C.
Posts: 640
Default

Hornady may also be doing it because of the longer bearing surface that many of their bullets have that generally raises pressure a bit. Rcolarco is being conservative which generally works very well on a target and I follow his thinking too.
Reply With Quote
  #6  
Old 04-03-2018, 03:22 PM
Jtbaker1989 Jtbaker1989 is offline
 
Join Date: Aug 2014
Location: Shelbyville KY
Posts: 197
Default

What edition of Hornadys manual are you using?
__________________
Quote from 6.5 Swedish - "AP aint for the range son"
Reply With Quote
  #7  
Old 04-03-2018, 07:03 PM
mac1911 mac1911 is offline
 
Join Date: Oct 2009
Posts: 2,551
Default

What rifle are you loading for.
I am loading 308 for a M1 garand in 308
With 155 nosler CC I use the hornady 7th and just started with the lowest listed data for my powder,
I found my 100% function and 10 ring accuracy at about 1/3 the way to the max charge.
Reply With Quote
  #8  
Old 04-03-2018, 09:08 PM
lapriester lapriester is offline
 
Join Date: Oct 2009
Location: Cobb, N California
Posts: 15,810
Exclamation

I run 42gr of 4064, 155 CC, CCI 200 primers, 2.80 OAL in my 308 NM modified Garand and it's deadly accurate. Consistent 1-1.5 MOA. Why the BR primers? That's a lot of un-needed expense IMHO. I've done extensive accuracy testing with higher charges and all it accomplished was wasting powder. I use this same load in my 7.62 NATO Navy Garand and my 308 AR10. With all of them it produces excellent results.

It has never been my experience that higher charges, more velocity and higher pressures produce better accuracy.

Last edited by lapriester; 04-03-2018 at 09:17 PM.
Reply With Quote
  #9  
Old 04-04-2018, 07:45 AM
GrampawEd GrampawEd is offline
 
Join Date: Oct 2009
Location: Texas
Posts: 859
Default

Ditto the 42 grains of 4064 and 150 grain bullet. That recipe works great with every .308/7.62 rifle I load for: Navy Garand, Winch M70 Coyote and Winch M88.
Reply With Quote
Reply

Thread Tools
Display Modes

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



All times are GMT -5. The time now is 05:49 PM.