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Magnum primers with Hodgdon H335 in 223/556 cases
Discussion regarding the reloading of ammunition and tuning of loads for accuracy
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PaulS
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Location: South-Eastern Washington - the State

PostPosted: Fri Jul 19, 2019 4:53 pm    Post subject: Magnum primers with Hodgdon H335 in 223/556 cases Reply with quote

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.

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Paul
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Speer, Lyman, Hodgdon, Sierra, and Hornady = reliable loading data
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Always check data against manuals
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pete4d
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PostPosted: Fri Jul 19, 2019 6:10 pm    Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases Reply with quote

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

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Bushmaster
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PostPosted: Sat Jul 20, 2019 8:54 am    Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases Reply with quote

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
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PostPosted: Sat Jul 20, 2019 2:50 pm    Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases Reply with quote

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.

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PaulS
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PostPosted: Sat Jul 20, 2019 3:05 pm    Post subject: Re: Magnum primers with Hodgdon H335 in 223/556 cases Reply with quote

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.

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Paul
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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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