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Post by tdillinger on Oct 4, 2010 19:53:07 GMT -5
I dont know what powders burn at what temps, i have seen recently that in cold temps it is suggested to use a duplex load. I dont have a lot of knowledge about such things. for example i use a factory load 4759 not sure what Temp it is good for but i know it works at 60 or so. How do you find or know the temp ratings and what powder for the duplex load to ignite the 4759 (or major) LOAD.
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Post by DBinNY on Oct 4, 2010 20:16:50 GMT -5
Your 4759 will work fine in cold temps. It is a book powder and one of the reasons it qualified as such is because it is not temp sensitive. It is also commonly used as a "booster" powder in duplex loads for that reason.
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Post by tar12 on Oct 4, 2010 20:19:00 GMT -5
N110 and N120 and 5744 are also proven single powders. Though the N120 can be hard to get at times.
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Post by ET on Oct 4, 2010 20:52:46 GMT -5
Tdillinger
First off for clarification as previuosly stated the book load of 4759 doesn’t require duplexing but is used as the igniter for a slower burning powder when using a duplex load.
To start off with when a slower powder is used in a duplex what can be obtained is higher velocity without approaching excessive pressures. This involves a small quantity of igniter powder to ensure good ignition when a slower powder is placed on top and before the sabot/bullet load.
To get an idea of the velocity gain you need to go to the above sub-board labeled as LOAD INFO, then proceed to SMOKELESS LOAD DATA BASE and then go to 50 Cal Saboted Duplex Loads.
This should give you a good starting point to see what is available. But I do recommend that anyone starting out should spend sometime getting familiar with the single powder book loads before jumping into duplex. Just my opinion and take it for what it’s worth.
Ed
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