Per the suggestions of some of the other forums members I have also started doing testing with IMRs SR 4759 powder for reduced loads.

Although I am know as Mr. Blue Dot, (by some) I am always looking out for powders that offer a lot of flexibility. SR 4759 has proven to be just that.

I have tested it in a wide variety of cartridges, and have found it as impressive as blue dot and superior in some ways!

So per the request of a friend, the first posting will be with the 125 grain Sierra SP in the 30/06.

Accuracy was excellent and the max loads were determined by some OLD data from P.O. Ackley's books and some OLD IMR data.

If this proves to be as popular as Blue Dot loads, more will follow as I get them documented.

Cheers and Good shooting
seafire

Range Report: 30/06

Powder: IMR’s SR 4759

Bullet: 125 grain Sierra SP

Case Used; Remington

Primer Used: CCI Large Rifle

Rifle Used: Winchester Model 70, 24 inch barrel


20 grains: 1911 fps
21 grains: 1937 fps
22 grains: 2074 fps
23 grains: 2134 fps
24 grains: 2195 fps

25 grains: 2253 fps
26 grains: 2344 fps
27 grains: 2406 fps
28 grains: 2434 fps
29 grains: 2511 fps

30 grains: 2575 fps
31 grains: 2661 fps
32 grains: 2682 fps
33 grains: 2742 fps
34 grains: 2803 fps
35 grains: 2848 fps

Accuracy was excellent with this powder, and this bullet. Easily within “minute of coyote or prairie dogâ€

Recoil reduction noticed a lot at 25 grains or less.

No filler needed, this is a bulky powder.

This powder is very stable and did not show any signs of pressure spikes when higher than 35 grains was loaded.

As always work up your loads, when approaching the max limits.

35 GRAINS will be recommended as max, and proved to be safe in MY Winchester Model 70. These loads and velocities were also tested in a 1917 Enfield with a 26 inch barrel and in a 1903 Springfield with a 22 inch barrel. Neither barrel lengths showed any appreciable differences in velocity or accuracy.

I have been using 4759 for half a century and I recomend it for reduced loads.

My formula for light bullets in a caliber has been 1/2 of the charge by weight of IMR's SR 4759 of what a full load of conventional powder would be.

So if an 06 takes a load of 60 grs of powder with 125's then the 4759 load is 30 grs. That's all there is to it.

The great benefit of this formula and IMR 4759 in general is that, due to the built in bulk of the powder, one cannot double charge a reduced load. This is very important.

For me I can only claim 4 decades with 4759, and heartily agree with "99" about his formula and the applications. This is a great way to go, and by the way the Speer 235 grain and the .375 H&H have an awesome relationship for accuracy with this method...

seafire/B17G - Thanks to you (and Savage99 and Sako308) for the report on SR 4759. I just hope that you are planning to test this powder with a .243 in the near future (hint, hint).

Pagris,

testing in the 243 has been in progress for a while.

It has just gotten side tracked with being tied up with my son's Boy Scout Troop, and being a Cub Scout Troop's committee chairman.

Loading up tons of ammo for Spring Sage Rat shooting has also been taking up a lot of time.

The plans are that the 243 will be tested with SR 4759, and the following bullet weights, which are already done:

55 grain Ballistic Tip
60 grain Sierra HP
65 grain V Max
70 grain Speer TNT
75 Grain Hornady HP
80 grain Ballistic tip
85 grain Sierra HP

Left to do are the following

90 grain Speer or Ballistic tip
95 grain Ballistic tip
100 grain Sierra SP
105 grain Speer SP
105 grain A Max
107 grain Sierra HP Match

Hopefully I have not left any GOOD bullet or bullet weights out of the list. I am a 6mm fan.

I will spot check these max loads in the 6mm Rem also. By experience the longer case is capable of about 2 more grains as max load, with the increased velocity.

Testing of a 6mm Rem with 30 grains of SR 4759 and both 75 grain HPs and 80 grain SPs have shown to be very very accurate also.

Stay tuned, to next week, Same Bat Channel, Same Bat Time.

Cheers and Good shooting
seafire