Been using IMR 4350 in my 340 Wby for 25 years. Loaded three with IMR 7828 sec with 91 grains. Averaged 3306 fps. Primer a little flat so I am going to reduce the load a little a check accuracy. Using 200 grain Noslers. Never broke 3000 fps before. Optik1

Sorry IMR 7828 sec. Super short cut.

Seems like a made to order powder for most of the WBY rounds. Like you, used IMR-4350 in my .300 Roys for decades. Mostly b/c accuracy was superb. Drove 180s to about 2950 fps, about .300 H&H numbers, and from 24" bbls. No complaints, killed everything just fine.

Last year started messing with regular IMR-7828. Stuff sure makes horsepower. Both 24" 700s comfortably spit 200 gr Partitions at 2950+ fps w/78 gr in RP brass. Also pushes 168 gr TTSXs over 3250 fps w/82 gr. Every bit as good in the accuracy dept as IMR-4350.

Thanks for the post. Really is good stuff.

I've had really good luck using this powder in my 8mm Remington Magnum with 200 grain bullets. 3,200 fpes with no pressure problems.
It also works with outstanding results in my 6.5x55 Swede rifles at 800 yards.

IMR 7828 gives me the highest velocity and best accuracy in my .270 and 300 H&H.

Surplus 4831 has been my standby powder for decades, but my supply is all but exhausted. I ran some comparisons between it and IMR7828SSC in well-established loads and found that the 7828 virtually duplicates the old Surplus 4831 when charges are increased from 2 to 4% by weight. The SSC version packs tighter than the regular stick 4831, so a slightly heavier charge will usually fit in a given load even if the load was at 100% density with old 4831. If you were a lover of original Surplus 4831 then you'll likely find 7828SSC to be a worthy replacement -- and in some instances it will be better than 4831.

By the way, in my experience none of the commercially-produced 4831's (three from Hodgdon and one from Dupont/IMR) do that well in reproducing the pressure curve/velocity/accuracy of original Surplus 4831.

I used it in my 300 Wby and 300 H&H some time back and it is definatly impressive..I used old milsurp surplus 4831 for years and still have a good deal of that old powder from my 150 lb. SS powder can..I use that can for oats these days and have the powder in RL-containers, about 25 or more pounds..It will get more velocity and less pressure than any modern powder and out performed 7828 SC in both of my guns by a bit. but it cuts grs. in a measure and that's a pain IMO...so it just sitting there these days.

I began to use it when I couldn’t get RL22 for my 416 Rigby. Loads are nearly interchangeable. Works well for me.

I don't know why I didnt use 7828 earlier. I was kind of hooked on Winchester powders and especially 780. One day I decided to get some dies for the 300 Weatherby Mag and load for it versus just using Weatherby factory ammo. I tried 7828 and it was good from the get go. I started loading others with 7828 afterward. Maybe it wasn't always this good.

I use IMR-7828ssc in 270Wby,270,280AI. I started using it before short cut in the Wbys and been only powder I used in Wby's.

I just sneaked a peek at Barnes data for my daughters new Weatherby MkV 257 Arroyo that is off getting some work done.

Guess what one of the recommended powders throwing a Barnes at 3500 fps is? Yep I am liking this 7828.

Just finished reloading. Went with 90 grains imr 7828 ssc and 200 gr nosler ballistic tips. 3260 fps shooting into a quater at 100 yds. Optik1

That's the only powder I've tried so far in the .358RUM and 250's.

90gr=2884
99gr-= 3260.

Don't feel I need that much so next loadings
will back down a bit to about 3000fps. Should be a dandy load.

Next I want to compare 4831ss.

George

I use 7828 SSC in my 257 and 300 Wby to great effect. Easy to find a load that works well.

It did NOT work very well in the 6.5-300 Wby, though. Had to go to US869.

Any thoughts about the newer IMR powders like 7977?

IMR7828 is one of my favorite powders. I first used it in the .300WM with 180-220gr bullets and it was the most accurate powder with the right speed. In .270 with 150gr bullets is fantastic, and I even use it in the .243 with 90gr bullets. I have found that it's more temp resistant then H4350 in the .243. The only reason I can come up with is that it fills the case.

The highest velocity that I've ever achieved with a 100-grain bullet in a 22" barreled 6mm Remington was with IMR-7828SSC.

quote:

Originally posted by ANTELOPEDUNDEE:
Any thoughts about the newer IMR powders like 7977?

Not to hijack the thread but I've used this (IMR 7977) in a 280 AI, 6.5 x 280 AI and a 300 RUM with excellent results.

Zeke

In response to ANTELOPEDUNDEE, I use IMR 7977 extensively. It is "similar" in burn rate to H1000 (but not in powder charge weight! - i.e. do NOT use H1000 load data for IMR 7977).

I have used IMR 7977 on 300 Win Mag and 6.5 PRC. In general, I find the Enduron powders to reduce copper fouling, but more importantly to me in Colorado, they are less temperature sensitive than many powders.

And of course there's always Vihtavuori N565 !!

Regards,

Can anyone tell me if 7828 is easier on barrel throats than other powders? Still daydreaming about a .257 Weatherby.

For about the last month or so I have been trying 7828 in a 280 Remington and it's working great. Today I shot 4 162 grain SSTs over a chronograph and the average was 2908 FPS with very good accuracy. Regards

Open a 300 Weatherby factory cartridge with a 180 grain bullet. I believe you will find 85.0 grains of 7828 SSC.

quote:

Originally posted by lawndart:
Open a 300 Weatherby factory cartridge with a 180 grain bullet. I believe you will find 85.0 grains of 7828 SSC.

Ummmm. . . maybe, but factory loads most typically use powder which is from lots which test too far out of burning range to sell as canister powders. Powder lots will vary a bit in burning characteristics. When a lot is produced the manufacturer will test it to see if it falls within the parameters of "canister grade" powder. If not, then it is typically sold to an ammunition manufacturer who does their own testing and then adjusts their load(s) either up or down to use the slightly off-spec powder. So, the powder in given factory load may well be IMR7828, but it is likely a version which varies a bit from that which you would buy through the normal retail chain.

This is one reason that you are often told not to attempt to duplicate factory loads even if you have all of the "same" components.

Bill, the bottom line is throat erosion and the 257 Wby are bed partners, they just go together and powder for max loading all does damage, but the saving grace is the shooter himself by never letting the bore get hot..I had a 257 Wby on a Rem 700 that I shot 1,564 and sold it a couple of years ago, its now been shot 3200 plus some according to the owner, and still going strong, he took my advise and swears its a mircle..??? hot metal erodes..