6.5 PRC, H4831SC, 143 ELDX and 147 ELDM

[Explore the Wild]

I need to do a barrel break in using the components in the title. I see that Hornady list H4831 for both grain of bullets but didn't list H4831SC. Can I use the Hornady data for H4831 interchangeably with H4831SC? Does anyone have load data using H4831SC for 143 - 147 grain bullets (min-max charge)?

 

[sndmn11]

Yes H4831 and H4831sc are the same powder.

 

[Luked]

Only difference (If i am right) is the SC is a short cut variation. Of H4831
They have the same burn rate also

 

[The_Whitetail_Kid]

Yes, same powder just the shortcut version of it. Data can be used interchangeably.

 

[Explore the Wild]

Thank you all for your input!!

 

[jja600]

I have used H4831sc with the 147 eldms. Velocity was around 2900 with great accuracy and es out of a factory 24 inch Christensen Ridgeline supressed.

 

[Benjblt]

Only difference (If i am right) is the SC is a short cut variation. Of H4831
They have the same burn rate also

How can they be the same burn rate if one of them is a smaller grain? Honest question. . . because I always thought that grain size played into that.

 

[Ganderzone]

4831SC has been the most accurate powder in my 20" 6.5 prc. I have also found over half a dozen kegs or so that it tends to vary lot to lot. Anytime you change lots drop by a full grain or even 1.5 grains and check before resuming your max load. Ask me how I know..... Or just buy 8# and be done.

 

[Tanner]

How can they be the same burn rate if one of them is a smaller grain? Honest question. . . because I always thought that grain size played into that.

That is a really good question that I am curious to know the answer to as well.

 

[Pilsner]

My Christensen Arms MPR in 6.5 PRC likes 52.5 grains of H4831SC with the 147 grain ELD-M's.

 

[Benjblt]

My Christensen Arms MPR in 6.5 PRC likes 52.5 grains of H4831SC with the 147 grain ELD-M's.

What’s your speed and barrel length?

 

[Pilsner]

18" BSA carbon barrel and ~2850-ish at 2400'

 

[Benjblt]

18" BSA carbon barrel and ~2850-ish at 2400'

That's decent speed out of that barrel length.

 

[mlevimadden]

How can they be the same burn rate if one of them is a smaller grain? Honest question. . . because I always thought that grain size played into that.

That is a really good question that I am curious to know the answer to as well.

Powder manufacturers can apply a chemical retardant to the outside of the powder granules to slow the burn rate. I don't have any experience with the old H4831, but google says the chemical composition is identical, so modifying the retardant would be the way to keep the burn rate the same.

 

[Benjblt]

Powder manufacturers can apply a chemical retardant to the outside of the powder granules to slow the burn rate. I don't have any experience with the old H4831, but google says the chemical composition is identical, so modifying the retardant would be the way to keep the burn rate the same.

So, to confirm, what you're saying is that they are the same burn rate?

 

[mlevimadden]

So, to confirm, what you're saying is that they are the same burn rate?

They are listed in the exact same cell on the hodgdon burn rate chart, so yes they're stating they are the same burn rate. Below is from Hodgdon's website for H4831SC:

H4831SC is an Extreme extruded powder and the exact ballistic copy of H4831. Physically, it has a shorter grain size which earned it the “SC” designation for “short cut.” The shorter, more compact kernels allow the powder to flow through the powder measures more smoothly, helping to alleviate the constant cutting of granules. With the smoother flow characteristics comes more uniform charge weights, while the individual grains orient more compactly, creating better loading density.

 

[NWBLKTAIL]

18" BSA carbon barrel and ~2850-ish at 2400'

What chrono? I’ve never achieved book velocity with H4831sc in 243win or 6.5 PRC

That’s fast for that length barrel length and that charge weight from what I’ve tested

Edit: I switched to H1000 and everything lined up as it should

4831 had me thinking something was wrong, because of velocity