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Magnum primers with Hodgdon H335 in 223/556 casesDiscussion regarding the reloading of ammunition and tuning of loads for accuracy
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PaulS Super Member
Joined: Feb 18, 2006 Posts: 4330 Location: South-Eastern Washington - the State
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Posted: Fri Jul 19, 2019 4:53 pm Post subject: Magnum primers with Hodgdon H335 in 223/556 cases |
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I took three loads that I had worked up in my AR and substituted magnum primers for the standard primer. One of those loads was the one that gave me the most consistent velocities.----standard deviation
Load #--------SRP---------SRMP
1.--------------40.32--------22.99
2.--------------27.61--------28.21
3.--------------55.99--------29.70
It was just a "let's see what happens" trial but I may have to do some more testing to see if I can get a load in the teens.
As a note load 1. was 25 grains; load 2. was 25.7; and load three was 26 grains.
All using a 55 grain FMJBT and CCI primers.
The magnum primer does seem to be better in most loads. #2 is close enough to be within the tolerance at 0.6 FPS difference.
The values were collected using a LabRadar on the same gun, on the same day with 10 rounds of each load fired.
_________________ Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads |
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pete4d Super Member
Joined: Nov 27, 2011 Posts: 957 Location: Dixie , Alabama , & Louisiana
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Posted: Fri Jul 19, 2019 6:10 pm Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases |
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Paul,,,, Gonna mark and study this ,,, I'm not close to my load data ,,,, I normally reload 62-gr FMJ but i do 55-gr sometimes just not as much. Only thing I've found with the 335 powder is there maybe a few grains of UN-burnt powder left in the case ( never been able to figure that one out) the magnum primers may fix that issue .
Good luck on the loads
_________________ "march to the sound of the guns and shoot everyone not dressed like you"--D I 1968
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Bushmaster Super Member
Joined: Jun 12, 2005 Posts: 11395 Location: Ava, Missouri
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Posted: Sat Jul 20, 2019 8:54 am Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases |
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As most have AR 15s and I have to be different and have an AR 10 (.308/7.62X51 NATO). My load data would be of no use to most on here, but....
I found that I have best results using 45 grains of H380 and a WLRM primer and a 150 grain Flat base soft point. 2400 fps +/- 25 fps. Not so worried about the other specs. More into accuracy. Found that the standard primers just didn't do the job.
Remember that if you use a magnum primer that you reduce your powder charge by .5 grains if you are at or near maximum charge.
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Elvis Super Member
Joined: Jul 27, 2008 Posts: 9261 Location: south island New Zealand
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Posted: Sat Jul 20, 2019 2:50 pm Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases |
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Bushy...my bolt action .308 gets fed magnum primers (cause I bought a big box full) Im pushing a 180grn round nose not much slower than that.
as for standard velocity deviation.....yeah nah dont know and dont care LOL.
_________________ You shot it You pluck it !
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PaulS Super Member
Joined: Feb 18, 2006 Posts: 4330 Location: South-Eastern Washington - the State
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Posted: Sat Jul 20, 2019 3:05 pm Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases |
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That 26 grain load is not far from the maximum but none of them showed any signs of pressure. I will be concentrating on the loads between 25 and 25.7 for my shooting,
H380 is a good powder for the 308. I have used it in the past when my brother had a 308. Nice groups at around 5/8" with his Remington 788.
_________________ Paul
__________________
Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
So and So's pages on the internet = NOT reliable loading data
Always check data against manuals
NEVER exceed maximum listed loads |
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