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Old 03-14-2013, 05:25 PM
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Default IMR 4756 Powder for 9mm loads

IMR-SR-4756 is the ONLY powder I could find to start reloading 9mm. Will be using : FC brass, Win. primers, 125 Gr. cast bullets. Is this a powder that will have excessive leading in barrel? Just looking for a load for range use. What FPS range should I expect. Never loaded lead before thanks for ideas and help.
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Old 03-14-2013, 06:02 PM
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IMR SR4756 is the only powder I use for 9mm,from minimum charge to be still functonal up to 'nuclear' loads. BUT,I don't load lead,only JHP from 88jhp to 124jhp. It's on the 'slow' end of the burn rate spectrum for 9mm,but always has burnt complete & CLEAN & consistent.
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Old 03-14-2013, 06:16 PM
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According to my Lee manual you should be loading to a minimum OAL length of 1.125 inch. Since the 9mm has a relatively small case I'd play it a bit safe and set the OAL in the 1.135 to 1.140 inch range to start. Powder is 4.2 grains as a starting point for a velocity of 972 fps and max is 4.8 grains for a 1071 fps velocity. Personally, with that small a variation in velocity I'd start light and work up to testing a load 0.2 grains over the starting point. By doing this you allow a small safety factor for charge variation from however you dispense the powder and you're not pushing the upper limit.

Note the limited range for the weight of powder permitted, what it means is that this will be a somewhat "sensitive" load. As a result I would recommend that you hand weigh the first 20 or 30 charges you throw with your powder measure to insure that it will actually dispense the powder consistently enough. BTW, you will want to use a properly setup and checked BALANCE type scale to check your load weight, they are a lot slower to use but much more trustworthy than the electronic scales. If you find that every single load thrown is within 0.10 grain you can then proceed to load normally, if you see any flyers of more than 0.10 grain I'd recommend you weigh every single charge.

Finally in regards to leading from the aspect of velocity you shouldn't have a problem. However, Velocity is not the only component in causes for leading, how "hot" the powder burns and even the shape of the bullet base can come into play. I think that you'll have to load up some ammo, shoot it, and then see how clean your barrel is.
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Old 03-14-2013, 07:45 PM
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Quote:
Originally Posted by scooter123 View Post
According to my Lee manual you should be loading to a minimum OAL length of 1.125 inch. Since the 9mm has a relatively small case I'd play it a bit safe and set the OAL in the 1.135 to 1.140 inch range to start. Powder is 4.2 grains as a starting point for a velocity of 972 fps and max is 4.8 grains for a 1071 fps velocity. Personally, with that small a variation in velocity I'd start light and work up to testing a load 0.2 grains over the starting point. By doing this you allow a small safety factor for charge variation from however you dispense the powder and you're not pushing the upper limit.

Note the limited range for the weight of powder permitted, what it means is that this will be a somewhat "sensitive" load. As a result I would recommend that you hand weigh the first 20 or 30 charges you throw with your powder measure to insure that it will actually dispense the powder consistently enough. BTW, you will want to use a properly setup and checked BALANCE type scale to check your load weight, they are a lot slower to use but much more trustworthy than the electronic scales. If you find that every single load thrown is within 0.10 grain you can then proceed to load normally, if you see any flyers of more than 0.10 grain I'd recommend you weigh every single charge.

Finally in regards to leading from the aspect of velocity you shouldn't have a problem. However, Velocity is not the only component in causes for leading, how "hot" the powder burns and even the shape of the bullet base can come into play. I think that you'll have to load up some ammo, shoot it, and then see how clean your barrel is.
Balance type scale is what I use. Not looking forward to weighing every charge. Wanted a powder that I could mass load, just for plinking. I've loaded rifle and made a habit of weighing every 10 rounds. Will not use this powder if it's that sensitive. Not wanting to "cut corners" but there must be a better OR safer powder to use. But as we know, right now powder is hard to find.
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Old 03-15-2013, 08:49 AM
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Quote:
Originally Posted by 8DuckCaller View Post
Balance type scale is what I use. Not looking forward to weighing every charge. Wanted a powder that I could mass load, just for plinking. I've loaded rifle and made a habit of weighing every 10 rounds. Will not use this powder if it's that sensitive. Not wanting to "cut corners" but there must be a better OR safer powder to use. But as we know, right now powder is hard to find.
Just as a follow up, I will be loading on a Dillon SDB. Should I rely on this press to throw a charge within the limit of your suggestion? Would I be wise to try and find WST or WSF powder?
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Old 03-15-2013, 11:52 AM
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Out of curiosity I checked Lee's reloading manual for a 125 grain bullet and every powder that I have has a .4-.5 grain sepration between min & max loads: Universal, HS6, w231, sr4756, & clays!
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Old 03-15-2013, 05:32 PM
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Quote:
Originally Posted by MajorHal View Post
Out of curiosity I checked Lee's reloading manual for a 125 grain bullet and every powder that I have has a .4-.5 grain sepration between min & max loads: Universal, HS6, w231, sr4756, & clays!
Same here. Is the difference going to be how much the case is filled with powder? Looks like all loads would be close.
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Old 03-15-2013, 05:44 PM
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FYI, Cabelas had HP-38 as of this morning. It is a great 9mm powder, virtually identical to W-231. I ordered 5 pounds. A little more than I usually pay but I'll have it.
RichH

Last edited by aguablanco; 03-15-2013 at 05:48 PM.
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Old 03-15-2013, 06:50 PM
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Originally Posted by aguablanco View Post
FYI, Cabelas had HP-38 as of this morning. It is a great 9mm powder, virtually identical to W-231. I ordered 5 pounds. A little more than I usually pay but I'll have it.
RichH
Looks like it's no longer available, but they have W231 8lb.
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Old 03-15-2013, 09:14 PM
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I used to burn a lot of this powder about twenty-five years ago when I was doing some IPSC and a lot of pins and plates. I liked it a lot in the 357 mag plate/pin revolvers and with the 38 super and some 9mm also though I don't care for the 9 much.

Anyway 4756 is a sneaky powder and used to be pretty batch sensitive so you would always dump you last third or 1/4 of a can into a fresh one to balance out the differences. I found out that you had to work your way up to your load and do it in 1/2 grain increments. Back in the 80's and early 90's there was a lot of chatter about some of the loads listed in the manuals from Speer, Lyman and Hornandy and others. There was as much as 2.5 grains difference between max loads with 158 grain bullets and there were guys locking up guns because of it. As I recall from old Handloader magazine articles and other competitors it was essentially a problem with batch lots.

Anyway I have probably shot fifteen pounds of this stuff and used enough to buy in 5 lbs cans but I loved it. Once you dial into a load that gives you close to the velocity and accuracy you need then only increase in like third of a grain steps. When you get close to max the pressure will jump right up there and let you know with flattened primers. It can happen in less than a grain believe me and often in half a grain. But once you get there I find the powder to be most accommodating and the recoil and the way a semi functions to be very smooth or rolling like not sharp like H-110 or some stiff Unique loads. It also burns pretty clean and ignites easily so even mild primers play well with this powder

Good luck
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