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Very Hot Topic (More than 25 Replies) sub for 4759 (Read 1824 times)
art_ruggiero
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sub for 4759
Aug 31st, 2017 at 1:49pm
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im shooting a stevens 44 rebarreled to 25 20 ss. using 7.3  7.5 grs. 4759.  can someone recommend another good powder- load?  10 twist   105 gr bullet   thanks   art
  
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frnkeore
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Re: sub for 4759
Reply #1 - Aug 31st, 2017 at 2:45pm
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You can use the same charges of 4227. the burn rates are nearly identical (in most cases 4227 is slightly slower) and it may even shoot better, if your throwing your charges.

Frank
  

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art_ruggiero
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Re: sub for 4759
Reply #2 - Aug 31st, 2017 at 3:05pm
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thanks frank     art
  
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J Louis
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Re: sub for 4759
Reply #3 - Aug 31st, 2017 at 4:30pm
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AA-4100 & Alliant 300MP should also be very good choices AA-4100 being the most current popular of the two for the various 25's if used in a safe manor. 300MP is known for providing more or equal velocity with less pressure. As you can see on the attached burn rate chart 4759 and 300MP are close to being one in the same.

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JLouis
  
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oneatatime
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Re: sub for 4759
Reply #4 - Aug 31st, 2017 at 5:08pm
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Except that SR 4759 is a single base powder (nitrocellulose) and 300MP is a double base powder (nitrocellulose and nitroglycerine) and thus burns hotter.
  
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calledflyer
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Re: sub for 4759
Reply #5 - Aug 31st, 2017 at 5:47pm
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People much brighter than I am tell me that a burning rate chart is like water in a stream- always moving and changing places depending on where and what it's influenced by.
Just because the numbers are nearly together means very little in many cases. Be aware of what you are doing  before accepting that info.
For what it's worth- I have always had decent comparison between 4759 and either of the 4227 powders. Sometimes one would shine a little more than the other, but they were always safe to use sort of back and forth. Some cases I still can't say what one is the better.  The 4227 is real easy to measure, and that's a good thing. Of course, if you choose one of John's recommended numbers, they would measure well also.
  
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Schuetzenmiester
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Re: sub for 4759
Reply #6 - Aug 31st, 2017 at 6:41pm
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I would just be satisfied with 4227 in a 44.  That is all I shoot in my Ballard.  I don't risk the new hotter powders in it.  I shoot them in my Hiwall, but not the weaker actions even though many other do.
  

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uscra112
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Re: sub for 4759
Reply #7 - Aug 31st, 2017 at 11:43pm
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oneatatime wrote on Aug 31st, 2017 at 5:08pm:
Except that SR 4759 is a single base powder (nitrocellulose) and 300MP is a double base powder (nitrocellulose and nitroglycerine) and thus burns hotter.


Boyle's Law should tell you that, for a given pressure, the gas temperature is the same regardless of the powder composition.


4100 and Ramshot Enforcer have been shown to be the same powder in different canisters.  The Ramshot was easier to find when I went looking. 

My experience when I was working up loads for my .25-21 was that AA#9 shot significantly better groups and much lower SD than 4227.   YMMV, of course.   That #9 was an old canister, and some folks say the new production powder is not as good.
« Last Edit: Sep 1st, 2017 at 12:02am by uscra112 »  

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oneatatime
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Re: sub for 4759
Reply #8 - Sep 1st, 2017 at 1:13am
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In a static situation, yes. With powder the pressure curves can vary from one to another and, of course, the duration at any particular level. That is how 2 different powders can produce the same velocity at different max pressures.
  
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Schuetzenmiester
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Re: sub for 4759
Reply #9 - Sep 1st, 2017 at 1:27am
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My reason for 4227 is not risking an older, weak action using powders known for higher pressures or even erratic or unpredictable behaviours such a 296 or H110 have produced.
  

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oneatatime
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Re: sub for 4759
Reply #10 - Sep 1st, 2017 at 12:58pm
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Exactly. As I noted in reloading for a 44-40 Ballard #2, I found reports that SR4759 and 4227 have pressure curves in the FFG/FFFG ballpark.
  
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Schuetzenmiester
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Re: sub for 4759
Reply #11 - Sep 1st, 2017 at 1:33pm
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Thanks for the info.  I didn't know they were BP pressure powders.
  

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art_ruggiero
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Re: sub for 4759
Reply #12 - Sep 1st, 2017 at 1:36pm
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thanks to all that responded    art
  
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boats
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Re: sub for 4759
Reply #13 - Sep 1st, 2017 at 3:06pm
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I switched my 38/55 loads from 4759 to 4227 some time ago. Had always used 4227 for 32/40  Am happy with the results. No need to weigh throw direct from the measure.

Still have a good supply of 4759, reserving it for over 40 cal loading.  The old advice was 4227 32 and under 4759 38 and over. 

Boats
  
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oneatatime
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Re: sub for 4759
Reply #14 - Sep 1st, 2017 at 3:34pm
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Schuetzenmiester, just so no one gets the wrong idea, the pressure curves for 4759 and 4227 are similar to FFg and FFFg AT BLACK POWDER VELOCITIES not that they can be loaded grain for grain.
  
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