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JerryH
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38-55 Powder Charge
Jul 3rd, 2025 at 7:16pm
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I'm looking for some ideas on powder charges for a 38-55 using breech seated 255, 280, and 320 grain bullets.

Powders will be 300MP or H108. Various primers available if you wish to share your match loads.

  
I'm not a complete idiot, some of my parts are missing.
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Oakdale
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Re: 38-55 Powder Charge
Reply #1 - yesterday at 9:22am
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Jerry,

It's early in my "research". I have a new CPA in .38-55 and will be breach seating @ our matches. My mold is by Accurate, weighing about 345-grains and the barrel twist is 1;12.

Last year I was shooting fixed ammo in a Rem Rolling Block. That has a Green Mountain 1:12 twist barrel. The mold was a NOE 330-garin. I tried 300MP and 4198 but settled on IMR 4227.

So my limited research has me using IMR 4227 with the 345-grain Accurate bullet. I started at 16.0-grains, then tried 17.0-grains, then 18.0-grains. Next up is 18.5-grains of the 4227. That might be the max. charge that I mess with.

Right now I'm focused on finding a Weber type breach seating tool.

Tom
  
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oneatatime
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Re: 38-55 Powder Charge
Reply #2 - yesterday at 12:49pm
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Don't know about 38-55 but the data sheet that Hodgdon used to supply with H108 listed 2 loads for breech seated 202 and 204 grain bullets in 32-40. These were 12.6 and 12.5 grains respectively. These yielded 1368 and 1353 fps at 19,500 CUP. If you have a strong rifle and a chrono you might just try to get in the traditional 1400-1440 fps range.
  
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JerryH
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Re: 38-55 Powder Charge
Reply #3 - yesterday at 4:34pm
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Thanks. I should have mentioned that this is a Winchester HW, so it's plenty strong.
  
I'm not a complete idiot, some of my parts are missing.
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irish66
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Re: 38-55 Powder Charge
Reply #4 - yesterday at 7:10pm
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Have two 38-55
Highwall shoot nothing but 49 gr gooex cart with 360 gr 
Cody Ballard  b.s 18.5 grs 4759 295 gr mos
  
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