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gunlaker
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.38-55, IMR-4227, 320gr breech seated bullet
Jul 12th, 2019 at 9:07am
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Hi,

What would the useful, and safe, powder charge range be for a modern highwall chambered in .38-55 using IMR-4227, and a breech seated 320gr bullet?

thanks,

Chris.
  
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frnkeore
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Re: .38-55, IMR-4227, 320gr breech seated bullet
Reply #1 - Jul 12th, 2019 at 12:26pm
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15 - 19 gr. 20 gr would be safe but, the bullet might not like it.

4759 and 4227, are very close in burn rate. A famous (to me anyway) load, used in the 1970 - 80's was 18.5 gr 4759, BSed in rifles at least as strong as Ballard.

Frank
  

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Premod70
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Re: .38-55, IMR-4227, 320gr breech seated bullet
Reply #2 - Jul 12th, 2019 at 2:21pm
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I get my best accuracy with a Accurate 295 grain tapered bullet using around 20 grains of IMR 4227. That load is used in my C Sharps Highwall and is safe in my opinion for that type action, can't say I would use it a lesser strength action.
  
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ssdave
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Re: .38-55, IMR-4227, 320gr breech seated bullet
Reply #3 - Jul 12th, 2019 at 2:22pm
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I've had really good luck in mine using H4198 or IMR4198 and a 360 grain bullet.  Might be a little higher velocity than you're looking for; as I recall 21.5 to 24 grains gives 1200 to 1375 fps.  We use it for long range gong shooting out to 800+ yards.

I tested loads that were up much higher than that, but didn't need the velocity, so I know it is an absolutely safe load in my high wall.  I worked downwards to this load from about 28 grains.

The 4198 burns clean and consistently.  SD was a bit more than I would like to have, but that's always a challenge with small smokeless loads in large cartridges.  Puff-lon or powdered oat bran (ground up in my spice grinder) as filler helped with the SD's, but didn't appear to help accuracy noticeably.
  
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OLD TUCK
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Re: .38-55, IMR-4227, 320gr breech seated bullet
Reply #4 - Jul 12th, 2019 at 5:17pm
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I have been using 18.5 Gr 4759 for a number of years in my 38-55 rifles It has shot very good either fixed or breech seated. There also is a plus to using 4759. That is you cannot throw a double it will fill the case to the mouth and over flow. If you do not notice that then you should not be reloading. I like the big clumpy grains of 4759 as it takes up a lot of space in the Calibers I shoot. I do not find myself trying to "BUMP" powder charges to make sure they are down at the Flash Hole. HTH FITZ. OLD TUCK. Smiley
  
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Quarter_Bore
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Re: .38-55, IMR-4227, 320gr breech seated bullet
Reply #5 - Jul 12th, 2019 at 6:58pm
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I usually start out using 18 grains weight of IMR 4227 and adjust up from there. Maybe up to 19 or so but usually I just stay at 18 grains.
  
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gunlaker
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Re: .38-55, IMR-4227, 320gr breech seated bullet
Reply #6 - Jul 12th, 2019 at 10:12pm
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Thanks everyone.  That gives me a place to start.   I'm going to stick with IMR-4227 as that's what I've got on hand as I use it in my .32-40's.   

Chris.
  
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