|11-04-2007, 04:54 AM||#1|
Join Date: Feb 2007
Location: South Carolina
Best Powder Burn Rate Comparison Chart I Have Yet To Find
You need to print this page and keep in your reloading manuals or post on the wall of your loading room.
|11-04-2007, 06:51 AM||#2|
Join Date: Jun 2004
Location: St. Louis, MO
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.
|11-04-2007, 08:54 AM||#3|
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.
|11-05-2007, 09:09 PM||#4|
Join Date: Jul 2004
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.
|11-06-2007, 12:24 AM||#5|
Join Date: Mar 2007
"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.
|11-06-2007, 07:32 AM||#6|
Join Date: Aug 2004
Location: "Close, but no donut!"
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.
|11-08-2007, 08:19 AM||#7|
Join Date: Jul 2004
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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