Powder Cross over equivalent chart

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Powder Cross over equivalent chart

Post by DavidR on 1/8/2014, 2:04 pm

In today's hard times to find powder, this chart gives you equivalents to many powders used in our sport. Just posted as reference, use at your own risk.

http://www.adi-powders.com.au/handloaders-guide/equivalents.asp
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Re: Powder Cross over equivalent chart

Post by Rob Kovach on 7/20/2014, 5:16 pm

Hodgdon had this awesome burn rate chart:
https://www.hodgdon.com/burn-rate.html
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Re: Powder Cross over equivalent chart

Post by DavidR on 7/30/2014, 10:23 am

problem with the hodgon chart is it lists in a column and makes it look like powders are faster or slower according to where they are on the chart and the truth is many powders have the same burn rate, this is a better chart to use if looking for comparative powders, the clays international is the same rate as 700x and wst both excellent bullseye powders. Also some say wst is the same powder as international, being Winchester does not produce powder and is just a licensed name hodgon uses, just like hp-38 is w-231 just packaged different.

http://www.adi-powders.com.au/handloaders/equivalents.asp
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Re: Powder Cross over equivalent chart

Post by BEA on 2/24/2016, 5:22 pm

The problem with burn rate charts is that they are speculative, or in other words, educated guesses. None of these charts are arrived at by testing each powder in the same application to determine how they line up in terms of burn rate.  A characteristic of smokeless powder is that as the pressure goes up, the burn rate increases disproportionately faster. This is why you can get to a point where the pressures spike with small charge wt increases. The chemical makeup of a powder can determine how fast the burn speed increases as the pressure goes up. Some powders increase faster or slower than others. This simply means that you can make some general assumptions by looking at burn rate charts.  However, just because a powder is located at the same level as another on the chart does not mean that these two powders are indeed the same, nor does it indicate these powders will react the same in different pressure ranges.

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Re: Powder Cross over equivalent chart

Post by Aprilian on 11/1/2016, 9:27 am

Rob Kovach wrote:Hodgdon had this awesome burn rate chart:
https://www.hodgdon.com/burn-rate.html
chart moved - new [url=https://www.hodgdon.com/PDF/Burn Rates - 2015-2016.pdf]https://www.hodgdon.com/PDF/Burn%20Rates%20-%202015-2016.pdf[/url]
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Re: Powder Cross over equivalent chart

Post by scheibenpistole on 9/5/2017, 4:20 am

I recall an article from the 60s/70s in one of the big name magazines (Guns & Ammo?) that was titled "Blowing Up With 2.7".
It was a look into the phenomena of detonations purported to occur in the 38 SPECIAL when loaded with 2.7 gr bullseye under a 148 gr WC.
The results were inconclusive. They were unable to duplicate the effect, nor rule out the possibility that recorded instances weren't simply the result of a double charge.
But, there were some nagging concerns that they couldn't entirely rule it out.

Jim
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Re: Powder Cross over equivalent chart

Post by Wobbley on 9/5/2017, 9:06 am

IIRC, the article stated that the vast majority of shooters used Star or Phelps loaders for their loading.  Neither auto index to the next case.  Dillon copied and beefed up a Star to create his first progressive, the model 1000.  He even copied the cam actuated powder measure.  It, like the Star, was capable of dumping a second charge if you short stroke in either direction.  Dillon corrected this phenomenon in the design of the 1050 by adding a ratcheting one-way safety to prevent short stroking when lowering the die head.

In short, the vast majority of these blowups are from double charges.  Otherwise powder companies would no longer recommend using bullseye in 38 Special just like Vihtavouri no longer recommends N310 for wadcutter ammunition.

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Re: Powder Cross over equivalent chart

Post by scheibenpistole on 9/6/2017, 2:24 am

Thanks for that clarification.  I forgot about that part of the article.
Also, I was unaware of the recommendation concerning VV N310.
I have often wondered why the main subject of the article seems to have disappeared from general discussion after being a big concern for so long, all those years ago!
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Re: Powder Cross over equivalent chart

Post by SteveT on 9/6/2017, 2:24 pm

A few years ago I combined several powder burn rate charts. The Excel spreadsheet ranks the powders within each list from 0% (fastest) to 100% (slowest). When the same powder is found in at least 3 lists, it averaged the ranking to produce a super list. In general there wasn't much difference between the lists, but some powders moved up or down a little, probably due to differences in test methods.

https://sites.google.com/site/sdturner/shooting/powder-burn-rate-table

SAFETY WARNING - Just because two powders have the same burn rate DOES NOT mean that they are interchangeable. You still need to refer to the manufacturers recommendations and especially the max load for that powder and bullet. In general two powders with similar burn rates and loaded to produce the same velocity will usually produce similar accuracy results in a given gun, but the charge weight or volume will not necessarily be the same.
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