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SR 4756 and SR 4759 by DuPont
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greenmachine
Member
If memory serves I think 4756 is similar to Unique and can be used in the same cartridges. 4759 is used a lot for reduced loads in rifle cartridges, burns clean with very little unburned powder even with light loads.
canoe on the yukon
Member
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I've used both.As greenmachine said,4759 is good for reduced loads in many different rifle calibers.4756 is commonly used in similar applications to Bluedot.I've used it in hot 38 special to semi warm 44 magnum as well as heavy shotshell loads.
I seem to remember using one of these in 45-70 duplex loads years ago, but my records from those days were lost in a move. Don't remember what I bought it for but the <$6 price tag makes me think it was a while ago.
Skip Sackett
US Veteran
SR4756 is a "go to" powder for me. I use it in heavy 38spl, medium 357mag and regular 40S&W cartridges.
There are very few powders that will give you the velocities that it gives in these calibers. The other caveat is the pressure you get when achieving those loads. While I have no pressure testing equipment per se, when looking at the Hodgdon/IMR/Winchester data, (and their data was pressure tested) it almost always gives the lowest pressure for a given load.
I haven't used SR4759. I have used SR7625 and have no real need for it.
SR4756 is also the propellant used for "THE LOAD", just to throw that in there!
There are very few powders that will give you the velocities that it gives in these calibers. The other caveat is the pressure you get when achieving those loads. While I have no pressure testing equipment per se, when looking at the Hodgdon/IMR/Winchester data, (and their data was pressure tested) it almost always gives the lowest pressure for a given load.
I haven't used SR4759. I have used SR7625 and have no real need for it.
SR4756 is also the propellant used for "THE LOAD", just to throw that in there!
bmcgilvray
SWCA Member
Oh no! Not "The Load!"
David Sinko
Member
I am on the verge of four weeks of vacation and I'll finally be able to get to the bottom of this SR 4756 thing once and for all. Time to buy lots of batteries for the chronograph.
Dave Sinko
Dave Sinko
TSQUARED
Member
SR-4756 is a flake powder for small ga. shotgun as well as heavy pistol loads. Youi can find data on Hodgdons website. SR-4759 is a stick powder desgned for reduced velocity loads in rifles.
SpeedSkater
Member
Many find the SR 4756 to be one of the best powders for the .40 S&W and some like it best for the 9x19 (Luger), too. Reasons? Lower pressure but still fine velocity and accuracy. My daughter has found the SR 4759 to be her powder of choice for a reduced load in her .257 Roberts with 100g Spitzer (better groups than with the 117 factory loads).
SR4759 was,,don't know if it still is,,very popular for cast bullet loads in the 45-70 Trapdoor. Very accurate. Usually loaded, but not always with a wad over the powder charge.
Over powder wads are not the popular thing to do these days. But not so long ago it was.
SR4759 still popular in the 30-06 with cast bullets.
Loads are listed in any bullet weight range from 122 to the 210 in the Lyman cast bullet manual IIRC.
Velocity is in the range of 1600 to 2300+ fps depending on the weight of course.
Pressures are less than in loads using fast burning powders like RD,Unique, PB, ect when compared side by side using the same bullet weight.
..and the SR4759 minimum load velocity is usually about the max velocity of what one of the fast burn powders can achieve.
I use it in my Sedgley 30-06 sporter built on a low# '03 action.
Lots of cast bullet shooters like the powder too.
Over powder wads are not the popular thing to do these days. But not so long ago it was.
SR4759 still popular in the 30-06 with cast bullets.
Loads are listed in any bullet weight range from 122 to the 210 in the Lyman cast bullet manual IIRC.
Velocity is in the range of 1600 to 2300+ fps depending on the weight of course.
Pressures are less than in loads using fast burning powders like RD,Unique, PB, ect when compared side by side using the same bullet weight.
..and the SR4759 minimum load velocity is usually about the max velocity of what one of the fast burn powders can achieve.
I use it in my Sedgley 30-06 sporter built on a low# '03 action.
Lots of cast bullet shooters like the powder too.
oberon
Member
I have used 4756 in 9mm, .38 spl., .357mag with good results.
I think it is a little quicker than Unique, meters differently, and has lower charge density. My experience has been with loads at least 10%below maximum listed charge to start with, and not much more to get good performance.
I think it is a little quicker than Unique, meters differently, and has lower charge density. My experience has been with loads at least 10%below maximum listed charge to start with, and not much more to get good performance.
boatbum101
Member
4759 great cast bullet rifle powder , actually whatever you can use AA5744 in you can do the same with 4759 . 4756 can be used in a wide asst of pistol / shotgun loads . It does not like to be crowded & builds pressure quick in such conditions . My experience with these SR powders is they vary from lot to lot . When changing lots you'll have to adjust charges to match your developed loads .
I use SR7625 for 38sp target loads.
I use SR4756 for potent 38sp,357m,9mm,40s&w,10mm,44m. By potent I'm referring to any load powerful enough to properly cycle a semi-auto pistol up to 'nuclear' loads.
Both burn clean and complete for me.
I use SR4756 for potent 38sp,357m,9mm,40s&w,10mm,44m. By potent I'm referring to any load powerful enough to properly cycle a semi-auto pistol up to 'nuclear' loads.
Both burn clean and complete for me.
Green Frog
Member
I'll leave it to others to talk about 4756, but in my schuetzen days I used a bunch of 4759, mostly in 32-40s but occasionally in 45-70 as well. I don't currently own a 38-55, but it works very well for that cartridge also. I have never used duplex loads in the old high-walls and Ballards I shoot, but I have recipes for about 10% 4759 under a case full of black for a good clean burn. Two problems with 4759 though... it doesn't meter very well in most powder measures because of the stick shape, and it leaves some debris in my bore when I shoot the most accurate loads. I had to find the proper measure for the former, and I don't worry about the latter as long as accuracy stays. I like the stuff enough that there's still a 6# jug and a bunch of pound sized cans of it in the basement! 
Froggie
Froggie
I use 4759 in my Pedersoli Sharps 1874 .40-65 with cast bullets. My cousin uses it in his .38-55.
AZretired
Member
I used to use 4756 in 38 and 357 but it's hard to find in my area.
MichiganScott
Member
I've made it a habit to work up light loads using SR4759 for most rifles when I purchase them for years. I see no real reason to shoot full bore loads for practice. Light loads cost less and kick me around less.
SR 4756 is great for 38 and 357 magnum loads but I fould out in my 38 snub nose and 6" magnum that it settles down better with the heavier bullets and it has a power spike at the top of maximum charges and it does not do well with light charges in the 357 magnum with the 110gr jhp bullet, at least in my S&W 686 6".
SR 4759 is a nice reduced load powder and here are a few loads that I use.............
22/250 55gr fmj 13grs starting up to 19grs maximum of sr4759 @ 2750fps c/o 100 yard target or rabbit load.
30/06 hornady #3005 100gr plinker oal 2.93 std primer
20grs sr4759 1600fps 50 yard plinker load for the kids.
38 snub nose Mag-tech 158 LRN oal 1.55
SR 4759 10.0C @ 570fps 545-584fps 39 +/- 10ft 5@ 1.14"
SR 4756 5.0 gr @ 522fps 505-534fps 29 +/- 5 @ .83"
500fps is bare bones velosity for a 2" snub nose with a 158 lead bullet..............I went to a heavy crimp instead of the medium light crimp that I started with, to insure highest velositys with this minimum load.
Bullseye 3.2 @ 572 fps c/o the fast burn rate powders with med/light crimp......
With "Ultra-Lite" loads...always make sure there is a new bullet hole in the target or you see dust from the bullet,before pulling the trigger, again !!
Stay safe.
SR 4759 is a nice reduced load powder and here are a few loads that I use.............
22/250 55gr fmj 13grs starting up to 19grs maximum of sr4759 @ 2750fps c/o 100 yard target or rabbit load.
30/06 hornady #3005 100gr plinker oal 2.93 std primer
20grs sr4759 1600fps 50 yard plinker load for the kids.
38 snub nose Mag-tech 158 LRN oal 1.55
SR 4759 10.0C @ 570fps 545-584fps 39 +/- 10ft 5@ 1.14"
SR 4756 5.0 gr @ 522fps 505-534fps 29 +/- 5 @ .83"
500fps is bare bones velosity for a 2" snub nose with a 158 lead bullet..............I went to a heavy crimp instead of the medium light crimp that I started with, to insure highest velositys with this minimum load.
Bullseye 3.2 @ 572 fps c/o the fast burn rate powders with med/light crimp......
With "Ultra-Lite" loads...always make sure there is a new bullet hole in the target or you see dust from the bullet,before pulling the trigger, again !!
Stay safe.
