Home Forums Reloading Big Game Rifles Latest powder burn rate chart

Glad to see this updated.


https://www.hodgdon.com/wp-content/uploads/2019/11/burn-rate-color.pdf

Nice, thanks!

It looks like they missed IMR 4320.

Looks like it should be #108(a)

I think they are way off on R26 at well below R25. I have used R26 mostly in medium 08 and 06 sized cases so it may slow down in the larger cartridges. It seems to in the 270 WSM and 7RM but still seems faster than R25. These are only approximate I know but this is an ongoing issue with R26.

That Win StaBall sure sits in an interesting spot.

I bet it’ll be popular.

Guys, remember that this “data” was developed in ballistic testing chambers, not in firearms. That means that the relative quickness may be different in actual cartridges - in fact it often is. The observed relative quickness of any powder can change depending on the cartridge in which it is fired. This chart is just a guide and may show RQ differences compared to your experiences. Don’t assume that two powders adjacent to each other have the same burning rate in your firearm, they may be much different. This not loading data. Caveat emptor.


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They also missed HP38 (same as Win231) but to make up for it they listed N130 twice #77,and #82. Probably closer to #77.

What they missed the boat on IMO is some of the Accurate Powder’s LT30,LT32 and 2015BR. They have LT30 as being the fastest burning rifle powder, faster than the 4198’s......not a chance. LT32 and 2015BR are also slower than listed. I agree with Tejano RL26 is listed slower than it really is.

Nice to have a new list that uses most of the newer powders though!!

Thanks for the link. I just searched for this a week or so ago to check on AR Comp and could not find a chart that included it.

Still omitting N565 and N570.

N130 is #82. #77 is supposed to be N120, they made a typo. Compare to the previous chart for reference; I happened to have it hanging on the wall and it lists N120 in that spot.

I need to get a can of Superformance and give it a try.

Tag

Misstated here, look at AA5744. According to them it’s a rifle powder. Also there hasn’t been any 2015BR since about 06-07.

Left off Norma URP &217 also

They made up for it by listing MRP2 which was discontinued a couple of years back.

Thanks Higbean, I was wondering when they were going to update the chart.

I agree that RL-26 seems faster than RL-25 in the loads I'm using.

Thanks to Higbean. But below says it all and I do believe that MD has stated such at times on here.

https://www.norma-ammunition.com/us/Ammunition-Academy/Reloading-Data/

When comparing different burning rate charts, one will notice variations in listed propellant ordering. Still, each such chart tells "the truth". Ranking differences result from use of different criteria. For example, a certain powder type can act slightly quicker than some other powder type, when used in 308 Winchester loads; however, when these powders are used in 7x64 loads, evident burning rates might reverse. Relative burning rate charts can never provide absolute data because too many factors are involved in how propellants burn within a cartridge chamber.

Misstated here, You want to go down that road IMR4227 and LIL'GUN are rifle powders too. My point was how far off this chart is on some of Accurate's powders.
LT-32 was developed with the help of Lou Murdica (hence the L in LT). It was to compete directly with N-133 in the 6ppc. for myself and all the others that I know that use it, it is just to the slow side of N-133. In fact I know several that blend a bit of LT30 with LT32 to speed it up a bit.
This chart shows LT32 at #74 in reality should be at least #85 LT30 is just as far off.
Accurate still makes 2015 in Canada, they dropped the BR suffix when they quit making it in Israel and the Czech Republic