SR 4756 or 700x

[MA5177]

Hey guys, Im starting to relaod as soon as the dillon gets here. I have reloaded before so I do have some background but have a powder question.

A friend of mine that I will be loading with has a bunch of powder, I am going to start with .40 and 9mm and have bullsey, unique, red dot but have large quantities of SR4756 and 700x. Which of the last 2 would you recomend starting out with a dillon 550?

[maxx03]

SR4756 would be your best bet. 700X meters like Corn Flakes.

[Fordtrucks]

Anything over 3 grns meters perfectly in my Lee pro auto disc and regular auto disc. Not sure about a Dillion. 700x burns really clean and has great accuracy in my fire arms. I have never had any bridging or low charges ( beyond the .1-.2 grn normal variance of most powders) but some have said less than 3 grns can cause issues. Lowest i load in my .40sw is 3.5grns and works well.

[JMP]

Both are flake shotgun powders. The 4756 has much smaller flakes though, making it easier to meter. Both are good powders. The 700X is a bit faster than 4756, so I'd use 700X in the 9mm and 4756 in the 40 if you are using both.

When people say it doesn't meter well, the problem is mostly on the Dillon machines with a chargebar and auto-index. The 700X does not do well. If you have your stuff polished up well, your charge should be reasonably consistent with just a regular Dillon charge bar. You should not get more than 0.2gr variance with 700X in a Dillon charge bar. Most of them will be inside of 0.1gr, and you'll probably want about 4-4.5gr in 9mm (though some people use really small loads in the 3s). You'd want a bit more with 4756. The 4756 should meter within 0.1gr variance. While it is a flake shotgun powder, the flakes are really small. In appearance, it will almost look like a spherical. Especially with the 700X, what happens is that when the machine auto indexes, it will toss part of the charge out of the case and onto your shell plate. This is because it is so light, and it will land fluffy in your case. Uncompressed, 700X will occupy about 2/3 of an empty case, so this gives it a propensity to spill over when indexing. If you take it slowly, you are fine. It is not good for cranking out loads very fast. It is good, however, for visually inspecting loads as it's fluffiness will tell you when it's about right.

Both burn nicely and can be used in autoloading pistols. The main problem is that they don't meter and index as nicely as sphericals.

[Burbur]

large quantities of SR4756

Does this mean a lifetime supply? If not, don't bother.

[MA5177]

Does this mean a lifetime supply? If not, don't bother.

I have a 12b keg that was still sealed, probably 35 years old.

Tha powder looks great, on the hodgden site they still list it as an option for most handgun applications on the drop down menu.

Why not use it? I was going to load .40 with 180g FMJ flat nose

[MA5177]

Both are flake shotgun powders. The 4756 has much smaller flakes though, making it easier to meter. Both are good powders. The 700X is a bit faster than 4756, so I'd use 700X in the 9mm and 4756 in the 40 if you are using both.

When people say it doesn't meter well, the problem is mostly on the Dillon machines with a chargebar and auto-index. The 700X does not do well. If you have your stuff polished up well, your charge should be reasonably consistent with just a regular Dillon charge bar. You should not get more than 0.2gr variance with 700X in a Dillon charge bar. Most of them will be inside of 0.1gr, and you'll probably want about 4-4.5gr in 9mm (though some people use really small loads in the 3s). You'd want a bit more with 4756. The 4756 should meter within 0.1gr variance. While it is a flake shotgun powder, the flakes are really small. In appearance, it will almost look like a spherical. Especially with the 700X, what happens is that when the machine auto indexes, it will toss part of the charge out of the case and onto your shell plate. This is because it is so light, and it will land fluffy in your case. Uncompressed, 700X will occupy about 2/3 of an empty case, so this gives it a propensity to spill over when indexing. If you take it slowly, you are fine. It is not good for cranking out loads very fast. It is good, however, for visually inspecting loads as it's fluffiness will tell you when it's about right.

Both burn nicely and can be used in autoloading pistols. The main problem is that they don't meter and index as nicely as sphericals.

Great info, thanks! I'm going to be using a 550b that I just bought, I also have 5 lbs of unique that I can use in 9mm.

I'm going to try some loads in 40 with the 4756 and see how it shoots.