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Old 11-04-2007, 04:54 AM   #1
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Best Powder Burn Rate Comparison Chart I Have Yet To Find

http://home.hiwaay.net/~stargate/powder/powder.htm

Hey yawl,

You need to print this page and keep in your reloading manuals or post on the wall of your loading room.
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Old 11-04-2007, 06:51 AM   #2
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Printing would be good; I could do without the music.

One thing that's always bugged me about burn-rate charts is that there are never firm numbers attached to them. Sure, it's nice to know that AA #5 is faster than Unique, but by how much? For all I know, two consecutive powders could be almost exactly the same, or they could be uncharacteristically different.
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Old 11-04-2007, 08:54 AM   #3
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Quote:
Originally Posted by FishInABarrel
... AA #5 is faster than Unique, but by how much?
It can depend greatly on the loading density. Unique and AA#5 might show very similar performance in a large capacity case at a low density such as .45 Colt or .45 Auto but show substantial differences in a higher density load in 9mm.

I looked over the chart and found some things I would question. It lists RL15 as slower than AA2700 which doesn't seem right. I know there are quite a few shooters who use RL15 in M1 and M14 patterns and I also know that AA2700 is too slow for the same rifles.
 
Old 11-05-2007, 09:09 PM   #4
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How do you know a powder is "too slow"?

IME, it seems to be not only variable by loading density, but also by general pressure range...maybe.

Before the manuals had much data on W-W WAP, I tried to work up a .357 Mag load with it using 125-gr bullets. It's a low-flash powder, good for 9mm and .40 S&W, and a few sources put those only 5,000 PSI/CUP/Piezo or whatever pressure units less than some other sources put the .357 Mag. Worth a try, right?

From my 4-inch, I got pressure signs and beginnings of sticky extraction at about the same velocities you'd expect from a 9mm load--well, maybe 50-75 fps faster since it was 125-gr and not the 115 like I usually loaded in 9mm.

Now Power Pistol, on the other hand, runs a lot faster for me in the .357 Mag, same bullets are 200+ faster and don't stick a bit. But they do flash pretty good...not as good as WW-296, but close.

The chart puts Power Pistol faster than WAP. Maybe so up to 33,000 PSI, but above that, WAP seems faster to me.

However, I don't "know" without pressure data. The sticky case pressure thing works only for Magnum pressures anyway but is even then a crude yardstick.

As far as the gas guns go, I won't take anyone's word of powder "xyz" being too slow for the M14-type unless they also give me some port pressure data. I've seen scarcely a peep on that, but I do "know" what the design parameters are, and I'm confident that any powder between IMR 3031 and IMR 4064 is OK--in .308 at least.
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Old 11-06-2007, 12:24 AM   #5
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"I looked over the chart and found some things I would question. It lists RL15 as slower than AA2700 which doesn't seem right. I know there are quite a few shooters who use RL15 in M1 and M14 patterns and I also know that AA2700 is too slow for the same rifles."

I would have thought so too,,,however ; an Accurate Arms manual I have lists specific match data and lists '2700' for use w/ the M-1,,,further I have data published by NRA ,,, An article by one John Clark on loadind for the M-1 using IMR4350 with bullet weights of 180 & 190 grns. ,,,the author clearly states that port pressure would be excessive w/ lighter bullets.
NRA has also published data for M1-a match loads using IMR4320

More than one way to skin a cat I guess.
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Old 11-06-2007, 07:32 AM   #6
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WW231 at #39 and HP-38 at #43? I was under the impression that these were exactly the same powder just sold under different names. And I have several sources where published loading data for the two is in fact identical.
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Old 11-08-2007, 08:19 AM   #7
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Quote:
Originally Posted by Snake45
WW231 at #39 and HP-38 at #43? I was under the impression that these were exactly the same powder just sold under different names. And I have several sources where published loading data for the two is in fact identical.
The ballistics dude at Laser-Cast Bullets/Oregon Trail Bullet Co. in Baker Oregon (http://www.laser-cast.com/) may provide some insights. As of about 10 years ago or whenever they came out with their own reloading manual, many handgun cartridge loads were published with separate data for WW-231 AND HP-38. They were different almost every time, but "different" to me like .308 and 7.62 NATO. (For example ONLY--I don't want to beat that dead horse again) Just look at and consider how real the difference is when the max loads of 5.X grains are exactly 0.1 different. Not all, but I clearly remember at least one being that way. I would call that difference within the statistical/testing "noise" tolerances.

Some other L-C/OTBC loads, however, had larger differences between the two powders, enough to make me pause and TEST before just substituting one powder for other on max loads.
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