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Thread: Viht N150/.260 Remington ?

  1. #1

    Viht N150/.260 Remington ?

    Has anyone tried N150 in the .260 Remington with 120 grain bullets ?

    I understand (from PMs) that two of our members have had success with Alliant Reloder 17, which has a similar burn rate to N150 albeit slightly faster.

    I fully appreciate that burn rate charts must not be used for load development.

    The Viht website lists a load for N150 with the Lapua Scenar bullet in 120 grains but not with the Speer soft point 120 grains.

    They state that they used an eighteen and three quarter inch test barrel for some loads but others marked with an * used a longer barrel.

    The shorter test-barrel load figures seem rather high velocity for what I have been getting in a 20 inch barrel with Sierra 120 grain Prohunters and 44.5 grains of N160, which average at 2,721 fps. Speer's max is 45 grains of N160.

    Whilst the 2,721 fps with a 120 grain bullet and a 1.25 inch group is plenty good enough for my stalking needs, I like to have a good trial of various components before settling on a load and sticking with it.
    A pessimist is an optimist with experience.

  2. #2
    Norm, N150 should be a good fit for the 120gr / 260rem. I did try N160 in my 260 early on, it was only "OK - ish". Velocity was not great, nor was accuracy, I gave it up as too slow.

    Your load of 44.5gr of N160 seems very mild to me, and your velocity numbers support that view. I would use the Viht N150 load data for a 120gr scenar without concern with any other 120gr bullet bar a monolithic copper bullet such as Barnes.

    My 260 was maxed out with 43.5gr of Reloder 17. In theory, Re17 is a little quick for a 260, it sits between N140 and N150, and case fill was poor, but it worked extremely well and I never felt the need to change it.

    Without looking up data, something in the 44gr - maybe 45gr - region of N150 should work well. The Chronograph is your friend keep a good eye on it, 2900 is possible with the 120gr / 260rem, but if you are getting good accuracy in the mid 2800's FPS, I would stop there and call it good.
    Last edited by Claret_Dabbler; 19-06-2015 at 10:54.
    Brian.

    Just because you are paranoid, doesn't mean they aren't out to get you......

  3. #3
    Interestingly Brian, your .260rem is shooting very nicely with 44gr rl17 and 123gr bullets. Also shoots well with 45gr (just not quite as well as 44gr) with no obvious pressure signs. I am using lapua .260 brass, neck sized and seating 10 thou off the lands. Had to totally redevelop the load upon buying new brass. 45gr RL17 gives 2883fps ave. 43.2gr gave 2765fps and I suspect 44gr should be circa 2815fps.
    Last edited by otisthedog; 19-06-2015 at 11:54.

  4. #4
    I've got a tub I could let you have a bit out of to try it if ya want foc, and what's more although I'm away next week the following week at some point I'll be down your way meeting jager as he's recrowning my 6.5 and I'll be picking it up so meet me with a tub and bobs ya auntie.
    Regards
    Jimmy
    Next time you're walking down the street and see a homeless person go buy them a sandwich and a coffee, change of fate and it could be you one day !!!

    BUY BRITISH !!!!

  5. #5
    Don't use 44-45gn N150 with 120-123gn class bullets in 260. Those loads are way too hot. 260 Rem is heavily affected by throat length and bore dimensions (as with all cartridges), also with bullet bearing lengths so there can be a significant difference in pressures between a long 120/123gn match bullet and a short PSP type. In a competition rifle set up for the 123s, I run 40.5gn N150 and that is 'hot', also 1.3gn heavier than Viht's max for the 123gn Scenar match. An expanding sporter bullet generating lower in-barrel friction and pressures may allow higher charges, but start low in the 36-37gn range and work up.

    Viht N150 is not a forgiving powder in this application - a 0.2/0.3gn charge weight increase can take you from an apparently happy load with easy bolt lift and good case life to a leaking or blown primer. Beware!

    Don't even think of comparisons with Alliant Re17 (aka Reload Swiss RS60, this being the Swiss powder repackaged in a different bottle). The RS 'EI' technology propellants use a very advanced 'deterrent' infusion process that totally changes their burning characteristics. Re17/RS60 is also a 'high-energy' type which has nitroglycerine added to its base nitrocellulose grains and this again changes the burn characteristics and pressure build-up substantially. The nearest Viht propellant isn't N150, but the quite different NG modified N550 which can accept considerably higher charge weights. Reload Swiss RS62, a 'traditional single-base' type to use Reload Swiss's own words is closer to the 4350s and N150/N160 in this cartridge and likely allows higher charges and MVs than N150 safely, although load data are very limited for this range so far.

  6. #6
    Maybe Refer to 260 load data on the Nosler site.?

    FWIW - I have used the RL15 recipe given here for 120 NBT, the results from my rifle are exactly as predicted in terms of velocity, and accuracy on paper is less than .5 MOA consistently.
    Last edited by Tikka 260; 19-06-2015 at 12:13.

  7. #7
    Quote Originally Posted by jimmy milnes View Post
    I've got a tub I could let you have a bit out of to try it if ya want foc, and what's more although I'm away next week the following week at some point I'll be down your way meeting jager as he's recrowning my 6.5 and I'll be picking it up so meet me with a tub and bobs ya auntie.
    Regards
    Jimmy
    Thank you for the kind offer Jimmy. I have half a tub of N150, which was one of the reasons for my question.
    You are welcome to call in on your journey for a cuppa though. Junct 16 A1(M) is only just over a mile from me.
    Thanks again.
    A pessimist is an optimist with experience.

  8. #8
    Quote Originally Posted by Uncle Norm View Post
    Has anyone tried N150 in the .260 Remington with 120 grain bullets ? ..
    No, and I don't have any plans to. I've worked away with N160 and 123 gr A-Max for 2+ years and have a satisfactory performance with Nosler brass and ~44.8 gr N160 at present. This recipe seems to work for me in both my long throated 260 Rem and short throated 260 Rem.

    Regards

    JCS

  9. #9
    Quote Originally Posted by otisthedog View Post
    Interestingly Brian, your .260rem is shooting very nicely with 44gr rl17 and 123gr bullets. Also shoots well with 45gr (just not quite as well as 44gr) with no obvious pressure signs. I am using lapua .260 brass, neck sized and seating 10 thou off the lands. Had to totally redevelop the load upon buying new brass. 45gr RL17 gives 2883fps ave. 43.2gr gave 2765fps and I suspect 44gr should be circa 2815fps.
    Interesting Tim. I always used resized Lapua and Norma 243 brass, wonder if that accounts for the difference?
    Brian.

    Just because you are paranoid, doesn't mean they aren't out to get you......

  10. #10
    Quote Originally Posted by Uncle Norm View Post
    Thank you for the kind offer Jimmy. I have half a tub of N150, which was one of the reasons for my question.
    You are welcome to call in on your journey for a cuppa though. Junct 16 A1(M) is only just over a mile from me.
    Thanks again.
    Not a problem and thanks for the offer of a cuppa, if time permits i may well take you up on that.
    Regards
    Jimmy
    Next time you're walking down the street and see a homeless person go buy them a sandwich and a coffee, change of fate and it could be you one day !!!

    BUY BRITISH !!!!

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