Burn rate H322 vs N133

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eww1350

Guest
During some tune-up and practice at the range yesterday..:)eek: windy)
I decided to try some H322 in my HV 6ppc..the powder measure was set for N133 at 3400+ fps..and shooting flat (no vertical)...I decided to throw some
H322 Extreme (2007) at the same PM setting, and "whoa nellie" it spit the 68 grain Bart's Ultra out at 3585 fps avg for 3 shots..:eek:...The bolt handle lift was fine, but the primer crater was lifted up to near blanking out...never mind the vertical it induced...
I would have thought that with most burn rate charts showing H322 much slower than N133, that it would have lost some velocity at the same load volume...
By the way I don't think the next accuracy node is up there 120 fps above 3400 fps...:D
 
THe Hodgdon chart has shown H322 as faster than N133 for quite some time.
 
322 seems to work best at around 28 grains give or take a little, I have seen reported that others have tried the 29 grain but I don't know if it was extreme version or not, so go carefully.
 
Another thing, powder speed is a matter of pressure at the same weight not volume. When you weigh charges thrown at the same measure setting, you will see that 322 weighs more...is slightly denser, so not only were you using a faster powder, but more of it.
 
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Powder burn rate

Lyman #48 reloading manual, Relative Burn Rate Chart, page 402, lists N133 at #49, H322 at #52: Lower numbers are faster than higher numbers.
 
Wow!!!!!!

I just shot 28.6gr of H322 (Barts 68gr Ultra) this morning and got an average speed of 3250fps.
 
I have shot H322 fillied almost to the top of the neck. I don't know how fast it shots but it didn't hole the primer. There was cratering around the firing pin endention.
But I have found that a light load of 26.6 works fine with the 68 gr cheek boat tail. And the Brass never has to be full length sized.
 
f d shuster said:
Lyman #48 reloading manual, Relative Burn Rate Chart, page 402, lists N133 at #49, H322 at #52: Lower numbers are faster than higher numbers.
Click to expand...

I don't really trust the Lyman chart and go with the Hodgdon chart. The Lyman manual was published in 2003 on data that was collected in 2002 or earlier. Hodgdon just published an updated version of their burn rate chart in the last few months and it is very close to their older chart.
And I think that eww's experince may verify that the Hodgdon chart is correct about 322 being a bit faster.

And it is free online.
Ted
 
Hogdon Reloading manual..

Hogdon's powder burn rate chart has H322 as faster than N133, but look at the majority of the powder burn rate charts online, and you will see H322 placed way down the chart as a slower powder...:confused:
I believe Hogdon has to be the authority on this since my results tend to support their placing it ahead of V133 as faster burning...
 
Just For

Chits and giggles I ran some numbers on Quickload.....................................

According to the data I use it would take 31.3gr to achieve that velocity, pressure in the 82k range:eek:
 
I think that some of the online charts are based on the old pre Extreme H-322 which was definatly a different powder. THe H-322 extreme is made by ADI but I am not sure who made 322 prior to that.
I shoot H 322 extreme as my main 6 PPC powder and also I use it when shooting bullets less than 80 grains in the 257TED. For bullets 80 to 95 grains I shoot H BenchMark which seems to be the same powder as 322 Extreme but with a deterent coating.
From my limited expereince H BM seems to be slower than N133.
 
Powder burn rate#2

Yes, good information: just ran off a copy. Probably more up-to-date than the Lyman info. I've always found Hodgdons guide numbers to be very reliable.:)
 
As soon as I read that bit that said "same measure setting" I could see where this was going !

As Boyd mentioned, the actual weight and burn rate is just part of the equation.

H322, Benchmark etc are all more dense powders than N133 and the same measure setting will drop a heavier weight of both those powders than it will of N133.

To get 30 grains of N133 I am up around 55 on my measure, the same weight of Benchmark or H322 would need a setting somewhere around the 51 range. I'd guess you dropped around 31 - 32 grains of H322, no wonder it was cranking along at a good speed !!! Thank goodness for strong custom actions and that Lapua 220 Russian brass !!

Bryce
 
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Also...

hecksf said:
I don't really trust the Lyman chart and go with the Hodgdon chart. The Lyman manual was published in 2003 on data that was collected in 2002 or earlier. Hodgdon just published an updated version of their burn rate chart in the last few months and it is very close to their older chart.
And I think that eww's experince may verify that the Hodgdon chart is correct about 322 being a bit faster.

And it is free online.
Ted
Click to expand...

The Vit chart in their reloading manual also show H322 to be hotter than 133.
 
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