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Powder burn rate

 
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  #1  
Old 12-01-2008, 07:51 PM
HTG HTG is offline
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Powder burn rate

I'm trying to find out were or if I can compare the burn rates between Retumbo and RL-22, does anyone know were I can find that data?
I am trying to duplicate Hornady 162 gr 7mm BTSP factory ammo. They just told me that RL-22 has the closest burn rate compared to there factory blend that isn't available in stores. But I load for another 7mm and would like to use Retumbo. Just not sure if it would what the results would be.
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Old 12-01-2008, 09:31 PM
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Re: Powder burn rate

Found it RL-22 rate 198, Retumbo rate 210. Anyone know if ths would make much of a difference? I haven't been reloading long enough to know.
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Old 12-01-2008, 09:36 PM
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Re: Powder burn rate

In my new Hornady 7th edition loading manual the burn rate chart has RL-22 at 117 and Retumbo is 125 on a 1 being fastest and 131 being slowest powders.

It goes H-4831, RL-22, VHIT N-165, IMR 7828, Win WMR, H-1000, Magnum, RL-25, VHIT N-170, Retumbo, H50BMG, etc.

Hope this helps.
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Old 12-02-2008, 02:50 AM
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Re: Powder burn rate

I don't know about those powders, but I do know that almost any chart will show AA#5 as slower than Power Pistol. Yet at very high pressures, AA#5 is faster, per my experiments.

What does it all mean?
A one dimensional burn rate chart would have pressure as an out of control variable.
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Old 12-02-2008, 08:39 PM
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Re: Powder burn rate

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Last edited by Michael Eichele; 12-02-2008 at 08:57 PM.
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Old 12-02-2008, 09:33 PM
HTG HTG is offline
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Re: Powder burn rate

I was looking at www.stevespage.com not sure what kind of powder burn rate chart that was. I think I'll end up purchasing two kinds of powders. Still wondering if I loaded two loads exactly the same, one with the retumbo and one with the RL-22 if there would be much of a difference in accuracy? After doing the little bit of reloading that I have I bet there would be. Thanks
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Old 12-02-2008, 10:04 PM
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Re: Powder burn rate

HTG,
I think that you being new to handloading, you shouldn't worry about 'burn rate' charts. They are in fact meaningless, because a powder burns completely differently inside a cartridge to the way they get their 'burn rate' chart information, it's called a 'callorimeter bomb'.
In fact, powder 'burn rates' vary depending on the pressure that it is loaded to, and the expansion ratio of the case it is loaded into, in other words, the size of the case capacity, compared to the size of the bore.
I wouldn't try to 'match' factory velocity in your rifle, it simply will not be likely to be able to achieve, they use 'blended' powders which have their 'burning rates' TWEAKED to match their published ballistics, which you simply cannot do with the canister powders we are able to buy.
My best advice is to try the 2 powders you mentioned and go with the one that is more accurate, higher velocity is neither here nor there when hunting is concerned, game animals never know the difference between 3000fps and 3200fps.

Just for your information, Retumbo is quite a bit slower than RE22 and may not work as well in the small case of the 7mmRM, but wonders never cease. I think a good powder would be RE25 if RE22 is not up to scratch.
Good luck, and good hunting.
Cheers.
MagnumManiac.
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