replacement for sr4759

[dogmower]

Hi all,
just heard that sr4759 is phased out, and no replacement in sight. Anyone have an equivalent powder? I love sr4759 in the 38/55 with a 250-265 grain cast boolit, and in the 45-70 with the 500 grain lee.
Any help is appreciated.
John

[dragon813gt]

There really is no equivalent. Unfortunately you're very late in finding out about it's demise. Buy up all the existing stock that you can. That's what most of us that shoot it have done.

[dogmower]

well, I have 4 pounds, but that won't last long. I am looking for a reasonable velocity (1600 fps or so) with a 250-265 grain cast, powdercoated boolit.
so far, have had fair luck with imr 4198 and imr 3031 (38-55). going to try aa 2230 and blc-2 next.
for the 45-70, imr 4198 seems to be a pretty good bet, just need data for the lee 500 grain pointy boolit, trying to get 1350-ish fps velocity with reasonable accuracy.
again, any input much appreciated.

[Shooter6br]

H322?

[marshall623]

I've had good results with RL7 , it meters well . It still doesn't fill the case as well as 4759. I've shot it in 7mm-08 & 308 .

[UBER7MM]

I finally came with with the perfect SR4759 load too.

[John Boy]

Comparative burn rate for IMR 4759 is Accurate 1680 and Hodgdon H110

[curator]

John Boy,

Those burn rates may be similar but AA1680, while metering well, can be very "fluky" with small changes in charge weight. H110 does not perform well when used for small charges in large cases. The best replacement with "off the shelf" powder is AA5744. Don't be discouraged that SR4759 is being discontinued. It is only a matter of time before one of the manufacturers comes up with a substitute. Most likely that will happen when sales catch up to demand.

[lotech]

I've used 4759 for years in a number of cartridges. When I heard it was no longer being made (they announced this once or twice before, years ago, as I recall) I bought an 8lb. jug to supplement what I already had. However, in the .38-55 and .45-70 and other cartridges, other powders will work as well, though it will naturally require some experimentation. A bunch of powders have already been mentioned in other posts. I suspect a few of those will provide inferior overall results in comparison to 4759, but they may be worth trying.

If I wanted to duplicate 4759 performance from velocity and accuracy standpoints, I would focus on 5744, one of the 4198s, H4895, and Reloder 7, probably in that order. Good luck-

[LAGS]

I vote for the Reloader 7.
In the cartridges I shoot I like the 7.62x54 .303 .308 and 8mm's it performed as well as the 4759.
5744 would be my second choice with the 4198s right behind

[dogmower]

well, made it to the range yesterday. 3031 seems the go to powder for the 45-70, but the 38-55 with both lee 250 grain and lyman 250 grain boolits and h322 (27 grains) and h4895 were all over the place. it seemed like the h4895 was leaving a lot of unburned powder in the barrel (too slow?). anyone use this powder with magnum primers? I have also tried modest loads of imr4198 with no luck and I don't think RX7 will get the velocity up around 1700 fps like I'd want. also, RX7 is scarce. I have some, but it seems to be drying up here in Tucson.
any help appreciated guys.

[lotech]

In a .38-55 Winchester / Browning Traditional Hunter, I load the Lyman #375449 flat nose gas check bullet (around 275 grains ww alloy) sized in a .379" die. I use CCI standard large rifle primers with all powders; can't imagine a need for magnum primers, but they would probably work fine. I don't recall unburned powder with H4895 or any of the others and my loads are all moderate ones in the 1,400-1,500 fps range. Loads are not crimped.

For higher velocities, my old notes from fifteen or so years ago indicate the Lyman bullet cast from approximately Lyman #2 alloy (15-16 BHN) and 30 grains H4895 had a muzzle velocity of 1635. 24 grains of IMR4198 gave 1715. Both loads were accurate. I found the harder alloy usually gave better accuracy at velocities above 1500. One noted exception, 29 grains Reloder 7 gave a muzzle velocity of 1,750 with the Lyman bullet cast from ww. Accuracy was good.

My results appear to be contradictory to yours, but keep at it. When I got involved in my .38-55 "project" years ago, I ended up firing in excess of 1,000 rounds using five bullets ranging in weight from about 250 grains to well over 300. The only mould I kept and still use is the #375449.