Home Forums Reloading Big Game Rifles IMR7828SSC in a 270 Win

I've always used some version of H4831 in 270 Winchester rifles, but with the current difficulty in obtaining powder can't seem to find any.

Have 8lbs. of IMR7828SSC on the way from Graf's, but I have never used it before. Would like to know other people's experience in the 270 and perhaps the 257 Roberts with the heavier-for-caliber bullets in each.

Tried Ramshot Magnum with the 270 150 Nosler LRAB bullet but ran out of room in the case before I reached the velocities that H4831SC gives. The long LRAB bullet must be seated pretty deep to fit through my 98 FN actioned Husqvarna 270 so I'm trying to find a dense powder.

Also have used a little RL25 but have had better luck with H4831.

So please share your experiences with IMR7828SSC.

I'd have to dig up my records but its great in 270 win. Its a virtual twin to re22 in using case capacity...just a smidge slower burning. Check out hodgdon.com....lots of data there. You will be glad you have that 8# jug!

Not the small cut, but have been using 7828 in the 270 quite a bit the last 3 years or so. I first tried it back in the 80's sometime.

It works well and velocities are about the same you see from H4831 ad 130 gr bullets, but with slightly heavier charges. Would not bother me if all I had for the 270 Winchester was 7828.

Thanks for the information. I now feel a little better about the purchase.

This has been mentioned in the past, but 7828 seems to perform about like the old 4831 of the O'Connor era, its a very good powder in a 270 Win. It produces good velocity and great accuracy in my 270's. Last, but not least, it is consistent to the extreme.

I have the SC version, but haven't used it in the .270 yet. Regular cut 7828 has worked very well for me though with the 150gr Hornady, and 160gr Nosler Partitions. It's definitely one of my favorite powders. You will like it, especially with the heavier bullets.

When used at a full case volume it is very temp resistant IME.

You have a great powder for the .270. Good for the 130gr bullets, great for the 150's. Only down side may be temperature sensitivity if you hunt in very cold temps.

7828SCC is a very good powder for the 270 & I use it in that as well as in the 280 Rem.

But, I do think RL-22 & RL-19 are a little better, depending on bullet choice.

No problems for me finding H4831.

MM

In another thread above, the guy is asking about loads for the .270. I'll repeat my comments here too. The load I've been using for my .270 is 57 gr. of Rldr-22 with a 150 Partition. This combo gives me 2930 fps and 1" groups. IF you can get some of that, you might try it. I found that the "old standard" powder (H-4831) just did not give me quite the accuracy I get from Rldr-22. Not knocking those that use it - it's just my experience.
I keep hearing about IMR-7828 but haven't tried it as of yet. Been thinking about it tho.
Good luck.
Bear in Fairbanks

Right now it is ALL about powder availability...

7828 is available...

Norma MRP gives about the same accuracy and speed as
RL22 and is available. Both work good in my 257 Roberts
and my 7MM Remington Mag, with heavy bullets.

Thanks to all who offered their information. The powder just came and now to the loading bench.

The weather is supposed to be good this week so I may get to test some loads and run them through the chronograph.

Got some preliminary results for my 270 W. rifle shooting IMR 7828 ssc behind Long Range Nosler Accubond bullets. WW brass, WLR primers. Velocity series starting with 56 g. and going up in 1/2 grain increments. Two shots at each increment; then averaged. (I do this just to get a feeling for how a powder new to me, works in my rifle.)

Rifle has a 23.6" long barrel and bullets are seated to just fit the magazine. Results:

56 g. = 2810 fps.
56.5 g. = 2846 fps.
57 g. = 2883 fps.
57.5 g. = 2895 fps.
58 g. = 2917 fps.

No loads gave any particular sign of high pressures (e.g. stiff bolt lift, etc.). They extend to a little above some book values.

Sounds pretty normal to me.Thanks for the info.Interesting how similar those numbers are to WW II H4831 and 150 gr bullets.

Bob, matching the old surplus H-4831 powder performance sounds great to me.

I cut my teeth as a beginning re-loader buying surplus H-4831 in paper bags for 50 cents a pound (as I recall). Then stuffing 62 grains in Win cases and shooting them in an old pre-64 M70 270 with a chopped off barrel.

Used that brass and charge weight because JO'C said that is what he used.

The rifle digested those loads for years with no problems - except for damaging my hearing in those pre-hearing protection days of the late 1960s. A 20" barrel in a 270 has a lot of muzzle-blast!

The non-surplus 4831 took me by surprise years later when I tried my old load in another 270 (Savage) my son had bought and we promptly broke the extractor on his rifle . In my defense I had not owned a 270 for years and had not kept track of the changes in 4831. (My son still uses the 270 - after I had the extractor replaced!)

when I load the 270 up for serious work like Elk Hunting, my favorite is 7828 or H 1000 behind the 160 grain SMP Partition...

Wind it up to about 2950 fps MV...... might be a little hot, might not.. the rifle doesn't ever seem to be upset about it, nor the brass, and it seems to shoot it into tiny little groups which helps out quite a bit...

CKW: Ran through those times myself...used a lot of 7828 when it came out, but in the 7 Rem Mag, not 270. Recently, the past 3-4 years I'v used it in the 270. I like the stuff.

That 270 is still one of the most accurate in the stable of bolt-actions we have between the both of us, we just had to find the right load for it.

I'd be interested what you all think of the current crop of H4831sc? To me it seems slower and I am finding I need a good bit more coal on the fire to match book velocities in 270 Win, 30-06 and 338WM.

This is over a number of different lots of powder as well, not just one batch.

H-4831 velocity from my 24" rifle is 2960 for 130's w/60 gr. and 2818 for 150's w/57 gr.Not bad.Not great for a 270.

7828 clocked @ 2883 w/150's with great accuracy.I need to try some 7828 w/130's for a test load.