The Speer Manual is WRONG!

[dcloco]

Quote from Mal H, "dcloco - I believe he said he was increasing the loads in .5 grain increments (clarified in post #8)."

You missed the point as well, with the SMALL cases, you need to work up in SMALLER increments. Pressure rises faster because the container is smaller.

0.5 grains in a 30-06 case, no problem. 0.5 grains in a 17 Rem, 204, 222, 223 case....can and usually is, a BIG difference.

 

[Clark]

CAUTION: The following post includes loading data beyond currently published maximums for this cartridge. USE AT YOUR OWN RISK. Neither the writer, The High Road, nor the staff of THR assume any liability for any damage or injury resulting from use of this information.

As much as I would like to emphasis that there is other BS "Speer 12" and "Speer 13", I find the threshold of trouble to be 30 gr, not 26.

http://www.thehighroad.org/showthread.php?t=17737&highlight=H335
torture testing the 223 brass
Ruger #1, CCI 400 small rifle primers, LC brass once fired processed from Scharch and prepped by me, 55 gr Vmax moly, H335, Quickload velocity and pressure at 24" barrel


charge/ case head/extr cut/ primer/ extraction/ Qpressure Qvelocity
unfired .365" .329................... na..................... na ... na ...... na
28 gr .369" .329"................ flat tiny cratering .... easy 55.6 kpsi 3370 fps
29 gr .368" .329"................ flat tiny cratering..... easy 63.3 kpsi 3488 fps
30 gr .371" .3295"............... cratered ............... easy 72.0 kpsi 3604 fps
31 gr .3725 .3320"............... leaked, cratered..... easy 82.0 kpsi 3718 fps

 

[ftierson]

Clark,

What is/was the lot number of the H335 that you used for this test, and about when did you purchase it?

Just wondering...

I'm almost betting that 28.0gr of current H335 will leave you wishing that you hadn't pulled the trigger...

Forrest

 

[Clark]

There are 3 numbers on the canister:
t0799 [vertical]
913-362-9455 [horizontal]
1 03100021 [sticker on the bottom]

I got it in August 2003, nearly 4 years ago.

How much you willing to bet?

I'll pay the $23 for a pound of new H335 and do another experiment.
You find the powder and drive it over to my house.
Er, wait, that won't work, you're 1000 miles away.

 

[peterotte]

That apparent sudden jump in pressure is interesting. It seems that some powders do that sometimes. Was your 26gr load tightly packed? You did say it was a hot day. I have plotted pressure-charge-bullet curves and found that at the top end, you sometimes get that 'jump' were the curve steepens suddenly.

 

[buttrap]

There is a reasion the manual says MAGNUM primers too. At max pressure the things will pop primers and using the magnum ones cures that issue. Belive me...been there done that with H-335 before and I would never use a standard small rifle primer in one again.

 

[CZ223]

Mugsie

I just checked my Speer number 11 manual as well as my Lyman 47th ed. and, a Hodgdon 25 manual. For the 55 grain bullets the speer tops out at 27 grains as does the Hodgdon manual. The lyman tops out at 26.5. My favorite load is a 52/53 gr. HPBTM from sierra over a charge of 26.5 grains of H-335 and it works in my AR-s as well as my Savage rifles with out any signs of pressure. I have also used this same charge with 55 grain spitzers with no signs of pressure as well.

J-Hansman, I have several Savage model 12s and can tell you in no uncertain terms that you will find the combination that I have mentioned above will produce some great accuracy. Of course your mileage may vary but, every one I have suggested this combo to loves it. By the way, I have also had very good results with both TAC and BLC-2 in approximately the same amounts.