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Old November 1, 2001, 10:35 AM   #1
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Low Pressure Hot Loads

Does anybody know what kind of powder produces less pressure for heavy pistol loads??Say H110,2400,AA#9,or#7,231,and so on.

Is there a chart that shows pressure in a given round??

I shoot .357,.44mag.,.45acp & colt"long",and was wondering if I could shoot a lower pressure round and be less wear and tear on the gun and me,and still get the performance.
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Old November 1, 2001, 01:09 PM   #2
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Supposedly Lil'Gun, which is made by Hogdon produces lower pressure than H110 and you get the same performance. WESHOOT2 has said to me that his experience is that it is not as consistant as H110 though.

Look at the websites and compare the pressures and velocities of different powders, they usually publish performance and pressure data for each powder and bullet weight.

Good Luck.

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Old November 1, 2001, 03:08 PM   #3
Robert the41MagFan
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On a relative burn chart, H110 is the slowest powder on your list. Followed by AA#9, 2400, AA#7 and Win. 231 being the quickest burner. In practice, 2400 is the most forgiving of the bunch.

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Old November 1, 2001, 09:42 PM   #4
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The performance of the bullet (as far as velocity is concerned) is dependent upon the pressure produced over a certain period of time.

To have a 240 grain bullet do 1200 fps requires approximately the same pressure regardless of which powder you use.

The difference is in which powders will develope that needed pressure.
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Old November 1, 2001, 10:08 PM   #5
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The velocity to the bullet is driven by the average pressure.

Dammage to the brass and gun is driven by the peak pressure.

The reason a 357 mag at a peak of 35kpsi gets a higher velocity from H110 than Bulleye is that the H110 has a lower peak to average ratio.

The problem with slow powders is space. The slow powders take up more room.

The fastest velocity powder for a given peak pressure is then the slowest powder that will fit.

As the powder chamber gets longer, the winning powder gets slower. Power Pistol is a winner in 9mm, and the longer 357 mag works best with H110 with the same bullet.

Today I worked up a 454 Cassul load that was full. The H110 would not compress, so I am stuck. No more power unless I want to go duplex loading.
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Old November 2, 2001, 04:59 AM   #6
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Try (bear with me now) holding the charged case against a turned-on vibratory case cleaner; the vibration sifts and settles the charge.

More room for boom.

(Old 10mm trick.)
"all my ammo is mostly retired factory ammo"
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