discrepency in load data

R

rebs

New member
different data on H335 powder

Nosler 23.0 - 25.0 grns with with oal of 2.260

Hornady 20.8 - 23.2 with oal of 2.200

Lyman 24.0 - 27.0 with oal of 2.260

Hodgedon 23.0 - 25.3 with oal of 2.200

Sierra 23.6 - 25.7 with oal of 2.250

why such a spread and which one do you trust ? I know work up from starting load but if there is no pressure signs where do you stop at 25.0 or 27.0 ?
My oal for best accuracy is 2.230, do I ned to figure that in ?
 
I trust all of them.
Reasons:
1. Different test barrels.
2. Different ways of "measuring" pressure.
3. Different primers.
4. Different Brass.
5. Different bullet used in testing.
6. Different temperatures in testing.
 
I seem to remember the confusion I had when I started reloading and found load data where one source's maximum was below a second's minimum.

I'm assuming the caliber is .223 Rem. Do you have a particular bullet/primer/brass combination selected yet? Your bullet selection should refine your direction.

Yes, the OAL is part of the equation. In a simple review of the posted data, you will note the higher charge weights correlate with the longer OALs.
 
yes 223 for my ar with 16" 1 in 8 barrel.
Hornady 55 gr soft point bullet
Lake city brass
H335 and cfe223 powders
CCI #41 primer
 
what I usually do is average out all the starting loads, in this case 22.88 grs.
Average out all the maximum loads, in this case........................ 25.24 grs.

Where do I start..22.88 + 25.24 = 48.12 divided by 2 = 24.0 grains
Starting in the middle has always been a good place. From here you can adjust the load up or down to find the "sweet spot" , the load your rifle does best with .

As far as data, I've always been pleased with Hornady data, especially if using their bullet in the load , but regardless of bullet make, have found it to be reliable. But having 4-5 sources is best...average them out.
Starting at the absolute maximum charge you can find listed anywhere is not the best practice, start low and work up.

Load safe,
Gary
 
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why such a spread
Click to expand...
There is no "spread" because the only things the same are powder and bullet weight (and I'm not sure about that one)

Otherwise, everything else is different, and all the loads are valid for their specific components
 
rebs
I know work up from starting load but if there is no pressure signs where do you stop at 25.0 or 27.0 ?
Click to expand...

If pressure signs were what mattered in this case [head], Remington would have never SAAMI peak average registered the 223 at the anemic 55 kpsi in 1964.

The 223 has a stronger case head than the belted magnum registered a 65 kpsi in the 8mm Rem mag in 1978, and the 223 case head is MUCH stronger than the Mauser case head registered at 65 kpsi in the 6mm Rem in 1955.

Why was the 223 registered so wimpy?
I don't know, but I can guess. There were AR15s with no gas adjustment system, and 55 gr and 55 kpsi was tuned about right to operate the ARs.

I have shot thousands of 223 rounds at 35 kpsi in single shots at rodents.
 
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