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Thread: Imr 7828 ssc

  1. #1

    Imr 7828 ssc

    I did some further tests with this powder in my 6.5x55 today. I worked my way up to 48 grains under a PRVI 120 grain BTHP and got consistent .5 MOA for three shots. Forty-nine grains is max so I may quit while I'm ahead. The powder meters well and ignition appears to be very consistent with CCI 200 primers. I am very happy with my first trials with this powder.~Muir

  2. #2
    Muir,

    Of the traditional IMR powders, this is probably the least known in the UK. Alliant, Hodgdon, and Vihtavuouri seem to be a bit easier to find over here. From the work I've done with them IMR 7828 and Vit. N165 are very close, so I would guess that the 7828 (SC) version is meant to compete with the Vit. which meters better. Most of the handloaders here seem to stop at N160 as it's ideal for .243.

    After using the standard 7828 in a 7mm RM, I decided to try it in 6.5x55 and .270 and I'm really pleased with it too. It's such a slow number that you can virtually fill any case with the coarser version, and still have a safe load. My usual in 6.5 is now Hornady 140gr SP (48.0) at 2550-2600 fps, and Sierra 160gr SMP (46.0) at 2400 - 2450 fps. With the Sierra 120gr I found that switching to IMR 4831 (again at 48.0) was the one to beat. All in all, these older stick-type powders have worked well for me, and there are plenty of loads around in the manuals for them.
    If I'm going to be accused of it then it's just as well I did it.

  3. #3
    muir do you find the imr powder a bit dirty ? i use imr 4007 ssc and it gives great fps and accuracy. and low es across the shots.

    but the powder i find compare to others i have used a little dirty.

  4. #4
    Quote Originally Posted by jay 22 View Post
    muir do you find the imr powder a bit dirty ? i use imr 4007 ssc and it gives great fps and accuracy. and low es across the shots.

    but the powder i find compare to others i have used a little dirty.
    Jay: I'd notice if I cleaned my rifles more often! Can't say I have, actually. Seems about as dirty as others.

    Sinistral: This powder dates from 1985 if I remember right so it's been around: I have never bothered with it. Until now, that is. I'm glad to hear of someone else using it. Even here, nobody used it. All the cans at the trading post -which does a brisk business in reloading goods- are covered by dust and priced several dollars less than other powders. They had two cans of the same LOT as the one in my reloading room so I bought them both. Should be set for a while....~Muir

  5. #5
    An update on the IMR 7828SSC.

    I have been back out with my FN 6.5x55 and this powder twice since I first posted this. Last evening was to check a change in priming from CCI to Remington 9.5's. I dropped the load to 47.5 grains as this load has proven to be the most accurate with the CCI primers. The results were sterling.


    I shot a small handful of groups that were just like this one or better. It is very consistent. I am glad I took a chance on it. It's given the best grouping so far.

    I'm going to test the same loads in my son's Winchester M-70 FWT in 6,5x55 and see how it fares.~Muir
    Last edited by Muir; 22-02-2012 at 03:02.

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