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Powder Crossover

My question is which powders are actually the same or considered the same such as W 231 = HP 28, HP 38
W 296 = H 110 etc.

I remember some years back Hodgdon's MSDS showed the powder equivalents.

Yep.
 
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I believe the posters point/question is, is their an actual publication showing the equivalent powders cross over.
Not the standard powder burn rate chart
 
My question is which powders are actually the same or considered the same such as W 231 = HP 28,
W 296 = H 110 etc.

I remember some years back Hodgdon's MSDS showed the powder equivalents.
I am probably the last person here that should be giving advice on powder safety with the crazy things we do with powders in our test guns. I do however have to put out a warning to you that in the old days we used to say some powders were considered "interchangeable" or "the same". That is NOT the case!

While what used to be considered "interchangeable" powders back in the day you will find are NOT interchangeable today (especially in small caliber bores, small volume cartridges and or cartridges with aggressive shoulder angles). You must also be VERY careful if loading reduced charge loads or subsonic loads in larger cases as the powder coatings applied act very differently and you will experience very violent pressure spikes. (which are called secondary pressure spikes) The general rule of reducing your "new" powder load by 15% of your normal powder load leads to even bigger problems in reduced or subsonic loads.

I really don't mean to sound like an old nag or put my nose where it doesn't belong. Trust me I've "ate a lot of primers" as we used to say and smoked a few bolts experimenting with powder loads. I do try to do it with strain gauges and modified equipment now having learned the hard way from previous testing.

I know people will tell you that its "the same powder sold under a different name in other countries", "marketed under a different name" "packaged with a different label" or "almost identical". In almost all instances you'll find that this is not the case. (In todays cartridges just lot to lot differences can cause you grief.)

I'm sure your probably very aware of some of this already and I just wanted to put it out there for others that may not have as much experience with reloading and happen to run across this thread.

I did add the Hodgdon provided Burn rate Chart below and hope it helps narrow down your search.

I do wish you the very best of luck on your reloading and upcoming shoot,

Carl C.

Extreme Accuracy
www.14caliber.com
 

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Good day,

I've heard you can use a faster powders load for a slower powder if the slower powder is less than six spot slower in the chart. Never tried it except in QL, and wouldn't recommend it from the QL results. Bad stuff can happen.

HTH,
DocBII
 
I've got so much "ancient" powder in my cabinet that may carry the same brand and number of new stuff, but I don't dare using it with loads published in modern manuals -- with out working up from a safe load.

I've got a chronograph now which I'm loving, and I'm finding that some of the old stuff is right on par, and some isn't. I HAVEN'T found any of the old stuff to be hotter, thank God.

I'm about to put together a portable loading kit so I can more quickly do the work-up at my range instead of driving back and forth so much. jd
 
I am risk adverse when it comes to reloading. So, while many powders are close in burning rates and I've read or heard that some are equivalent to each other, I do not buy it even though in a lot of cases where I had to substitute powders due to availability issues and found them almost identical in performance; I always treat a different powder as a new powder and cautiously proceed with load testing.

I only have two eyeballs and can't afford to lose one.
 
Have to be very careful with the types of chart you are looking at, the one DGP4 posted is not a crossover, just a burn rate chart that compares mfgrs in a fashion that days one powder is similar to another, but, not the same. Another example is that Shooter's world brought out a bulletin a few yrs back on RL22 changing mfgrs, and I believe at one time Art Alphin said it was the same as Norma 203 or 204, forget which, but SW said the mfgr went from Bofors to Lovex or vice versa and whatever version Lovex was making, but, they were now different than Norma or older RL22. Same deal as 4831, H4831, which has had 3 different mfgrs over the years.
 
I've heard you can use a faster powders load for a slower powder if the slower powder is less than six spot slower in the chart.

I've never heard that. At least not as a direct swap. I'd assume it would be a relatively safe practice (though not necessarily an accurate one) if you work up the load with the faster powder, but that's going against what the statement implies.
 
You will find that at one time Ramshot xterminator was the same as A-2230 and both were made in Belgium but now Accurate is made in USA since hodgdon bought it all up. Many Alliant powders are reformulated since the Hercules days, such as Unique, Herco, 2400, etc. Use old data for old powders. As already mentioned, lot differences make it necessary to work up new loads and so does powder equivalents. This is especially true given that most people are running on the ragged edge with pressures these days
 
Sorry guys (and gals) I forgot all about this thread.
When I asked about crossover, I was referring to which powders were considered the same.
And I do realize that the crossover may not be exactly the same.

Hodgdon shows the exact data for W 231 and HP-38, others do not.
While H 414 and W 760 are considered the same not all data is equal.

The HS-6 =W 540 I remember from the Hodgdon MSDS.
Someone posted here that Silhouette was the same as Winchester WAP.

And yes, the same powder number doesn't mean the same powder. IMR 4895 and H 4895 not the same.

I certainly do not assume any powders are the same and do some diligent data checking.
 

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