i just loaded up a bunch than read some where that they need magnum primers. will they not shoot well or what will happen?

Blarney

H335 is in my experience, just about the most accurate powder you can find in 223 with medium weight bullets, using Fed 205 or Win SR's.

If your loads don't shoot well, I'll make you an offer on your remaining stocks of H335!

Mark

Don't know, my 223 only gets W-748

"H335 is in my experience, just about the most accurate powder you can find in 223 with medium weight bullets, using Fed 205 or Win SR's."

Mark, I'll have to totally agree with you here.

I have found no advantage to shooting magnum primers when shooting H335 or any other classic .223 Rem. ball powder (ex. 748) given that they are all a relatively light load of around 24-27 grains.

I will say this, however, about H335. It is also one of the DIRTIEST powders for the .223. For that reason, I have started shooting Hodgdon Benchmark and can honestly say that I have had excellent results with both accuracy and velocity, but without all the cleaning in high volume shooting (prairie dogs, ground squirrels, gas-operated guns, etc).

Good luck to you!

My favorite 223 load is a 69 gn Sierra Matchking over 22.5 gns of H335 with a WSR primer. Super accurate in my 1:8 and also is super accurate in a friends Rem 700 1:12!

What size groups do you get out of the H-335?

quote:

h335 require magnum primers in a 223?

absolutely not....I used H-335 with standard small rifle primers (CCI) when I ran out of BL(C)-2 and had 0.0 problems at all.

I have been using H335 with standard small rifle primers in the 223 for more than 30 years. I have never tried magnum primers - is there supposed to be an advantage?

The 223 is registered at 55kpsi and is good to 72kpsi, unlike the 270 that is registered at 65kpsi and good to 62kpsi.

The .223 Hodgdon max load for 55 gr and H335 is 25.3 gr.

With CCI400 small rifle primers:
28 gr, extractor groove .329"
29 gr, extractor groove .329"
30 gr, extractor groove .3295"
31 gr, extractor groove .3320"

The standard CCI400 primer cup is thick enough to be stronger than the brass.
Somewhere around 4 grains over max, the primer pocket starts to go.
The primer may look cratered and even top hatted at 31 gr, but it is still good.
The primer is still holding at 5.7 gr over max.

The CCI450 small rifle magnum primer would do no extra good.

Seems about all I use in .223 anymore is Remington 7 1/2 primers. From what I have read ball powders are harder to ignite than stick powders. The 7 1/2 are marked BR but are a hotter primer to ignite ball powder better. 6 1/2 for the Hornet and 7 1/2 for eveything else. So far it's work for me.

Having tested WCC844 (335) in many cartridges including .223, the only time that I got hang fires is when using it with non Mag. primers in very large capacity cartridges. Even with mag. primers in the .358X.404 IMP. there were click bangs.
This does not say, however, that some erratic burning does not occure with lesser capacity cartridges. roger

When it gets below freezing and the ammuntion and rifle is of the same ambiant temperature (not just taken out of the PU or your pocket) hangfires in the .223/5.56 become a problem with H335 and some other ball powders. I have experienced this numerous times over the years. Best to use a Magnum type primer like CCIs 450s, WSRs or Remingtons 7 1/2. They are made to ignite ball powders under such conditions.

Larry Gibson

My 223 load is the Hornady 52 grain BTHP over 27.0 H335 and a CCI450 magnum primer. I have tried it with both standard and bench rest primers and it shoots best with the magnums.