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Thread: Experience of 308 Hornady interlock 150 sp (flat base) and n140

  1. #1

    Experience of 308 Hornady interlock 150 sp (flat base) and n140

    Hi all
    Ive been loading some Hornady interlock 150gn sp (flat base) for 308, using Norma cases and Cci br2 primers. Currently seated at 2.740" col, I've got up to 48gn of n140 without showing any signs of pressure . However in a 20" barrel I'm only seeing about 2540 ft/ps over the chronograph.
    I'm concerned to go any higher with the powder and was wondering what the experiences and thougts/ observations were of anyone else using this combination of components.
    ​dcg

  2. #2
    if you are seeing no signs of pressure just keep going until you do then back off,provided you still retain a good level of consistant accuracy,at the end of the day speed dosent kill accuracy does

  3. #3
    Hi see it shoot it
    problem is I'm starting to crush the load and from what I can tell 48 grains seems excessive, for that level of powder I was expecting to see about 2950 to 3000 ft/ps and then back down a bit.
    dcg

  4. #4
    Quote Originally Posted by DCG View Post
    Hi see it shoot it
    problem is I'm starting to crush the load and from what I can tell 48 grains seems excessive, for that level of powder I was expecting to see about 2950 to 3000 ft/ps and then back down a bit.
    dcg
    its called a compressed load,if you think your at your max FPS and you cant get no more in the case its time to change powders but I don't think you will see 2900 FPS with a 150 bullet

  5. #5
    +1 on the suggestion that seeing 2900/3000 fps for a 150g out of a 20" .308 barrel may be unlikely. I'm not familiar with the powder you are using, but the most recent Barnes manual lists 3 max loads at 2900+ fps. Two of the three are compressed loads, and all are from a 24" barrel. Nosler (#4) says max loads of RL 15, and IMR 4064 will push a 150g at 2900+ fps, but again, out of a 24" test barrel. Hornady (5th ed.) shows a couple max loads at 2800 fps from a 22" barrel.
    I would guess that it's been done - probably more often than I like to think, but I am not one to mess with loads beyond published maximums.

  6. #6
    My mate gets about 2950 with n140 and the 150 gameking out of a 22" barrel. Im getting 2770 with varget and the 150 from a 21" tube.


    Nutty
    Last edited by nuttyspaniel; 08-11-2013 at 21:57.

  7. #7
    DCG.

    Have you tried using a drop tube to get some more powder in the case?

    http://forum.accurateshooter.com/ind...opic=3828658.0

    http://www.21stcenturyshooting.com/Powder_Funnel.php

    Not that I want to encourage you to put 48gr on N140 in as that sounds too hot to me. 45.8 gr listed in Hornady Edition 8 as the book max for N140.

    Regards

    JCS
    Last edited by jcampbellsmith; 07-11-2013 at 07:53. Reason: too hot

  8. #8
    Quote Originally Posted by nuttyspaniel View Post
    My mate gets about 2950 with n140 and the 150 gameking out of a 22" barrel. Im getting 2860 with varget and the 150 from a 21" tube.


    Nutty
    Nutty. I wouldn't stand near your mate when he's shooting. Regards JCS

  9. #9
    Why don't you try Viht 540 - a double base powder with higher energy content.
    2540 fps sounds quite satisfactory to me unless you want to shoot deer at 1000 yards!

  10. #10
    hi dcg your bullet speed of 2540 is giving you 2148 ftlb of energy, well above the legal requirement for stalking if the round is accurate leave well alone.
    cheers Geoff

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