How much H-335 in a .223 Rem?

21 February 2004, 14:06

Major Caliber

How much do you use behind a 55gr bullet? I've been using 27gr's for years, but now everyone shows that is too hot. Hornady list's 23.2grs as max!

21 February 2004, 15:41

Gadolinium

Sierra fifth edition shows 23.0 grains to 27.5 for bolt actions. For the AR-15 they show 23.6 to 25.7.

21 February 2004, 16:07

ricciardelli

H-335 From 20.8 grains to 27.0 grains
Remington 7-1/2 Primer

21 February 2004, 17:22

Major Caliber

Quote:

Sierra fifth edition shows 23.0 grains to 27.5 for bolt actions. For the AR-15 they show 23.6 to 25.7.

5th!!! I haven't bought a manual in so long. My last manual is the Sierra 3rd edition.

21 February 2004, 17:32

Clark

Hodgdon website: 223 Rem, H335, 25.3 GR. 55 GR. SPR SP, 2.200", 24" barrel, 3203 fps, 49,300 CUP

Test: Ruger #1, CCI 400 small rifle primers, LC brass once fired processed from Scharch and prepped by me, 55 gr Vmax moly, H335

pic left to right: unfired, 28, 29, 30, and 31 gr.

unfired, extractor groove .329"
28 gr, extractor groove .329", 11% overload
29 gr, extractor groove .329", 15% overload
30 gr, extractor groove .3295", 19% overload
31 gr, extractor groove .3320", 23% overload

picture of brass and primers

I like to run 6% below the slightest growth so that would make my personal max somewhere between 27.25 and 28.25 gr.
I would need to expeiment more to resolve that.

21 February 2004, 21:26

sputster

In my Mini-14, 24.5gr to 25.0gr of H335 under a 55gr Win PSP produced 2800-2900fps.