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Thread: muzzle flash causes

  1. #1

    muzzle flash causes

    hi guys I went to have a play with a few loads today with the swede. I ended up with a few spectators as the rifle was performing with quite a lot of muzzle flashes. it wasn't every round but the majority. I wasn't using hot loads and the only thing I can think of that would cause it would be unburned powder. some of the cases were very sooty too. could all this be from seating too far out? its 6.5x55 and I was using 95 grain vmax bullets over 48.5 grains of n160 upto 49.5 grains. I stopped there as it was grouping 5 shots under thumbnail. any ideas? I wanted to try for better groups but didn't seem much point if its not burning whats already in the case. cheers for looking

  2. #2
    Quote Originally Posted by ziggy View Post
    hi guys I went to have a play with a few loads today with the swede. I ended up with a few spectators as the rifle was performing with quite a lot of muzzle flashes. it wasn't every round but the majority. I wasn't using hot loads and the only thing I can think of that would cause it would be unburned powder. some of the cases were very sooty too. could all this be from seating too far out? its 6.5x55 and I was using 95 grain vmax bullets over 48.5 grains of n160 upto 49.5 grains. I stopped there as it was grouping 5 shots under thumbnail. any ideas? I wanted to try for better groups but didn't seem much point if its not burning whats already in the case. cheers for looking
    If you're seating far out you will get a lower starting pressure for any given load.
    N160 seems slow for a 95gr bullet and 48.5gr is on the bottom end of the load at Saami spec, loading longer would explain the lack of obturation and the sooty neck.

    Stoke it up in increments or move to a faster powder or heavier bullet.

    Incidentally, do you have access to a chrono? I suspect that would show you some dissapointing velocities.

  3. #3
    I don't normally but I borrowed a chrono today and was just shy of 3000fps with the 49.5 I did have rounds loaded upto 52 grains but didn't see the point in trying them if it wasn't burning the amount of powder I had tried already.

  4. #4
    Ziggy
    It's hard to say. Could you give us some more info? Type of rifle? Length of barrel? Same issues with factory ammo? Mod on or off? Vintage of brass? Full length resized? Primers used?
    The Hornady manual does list N160 for this bullet weight and gives a max load of 49.6 gr. It's probably the powder I would have picked.
    Regards
    ​JCS

  5. #5
    Agree with Milligan...

    I'm on the Vihtavouri site, and they only quote N150 for an 85gr round.

    Nothing for a 95gr round, but when you get to 100gr there's a choice of N140, N540, N150, N550 and N160, so worth changing powders if you can

    However, 95gr is pretty light in the 6.5. The lightest I have is 120gr, but am pretty much exclusive on 140gr SST which will knock down anything in the UK... Foxes hate them!
    Sako 75 6.5x55mm-Z6i 3-18x50. MauserM12 .308-SIII 6-24x50. Beretta 690 III Field 12b.
    "You have enemies? Good. That means you’ve stood up for something, sometime in your life."
    Sir Winston Leonard Spencer Churchill (1874-1965)

  6. #6
    its a blaser r8, 6.5x55. using 95 grain vmax bullet on top of n160 powder in a lapua case with a cci 200 lr primer. only shot it with moderator on. brand new brass today the velocity was near as damn it make no difference 3000fps.

  7. #7
    Blaser/Blazer.....
    Owning a gun or knife and not using it, is akin to not sleeping with your girlfriend to keep her neat and tidy for the next bloke.

  8. #8
    +1
    does seem a tad slow burning for the bullet choice. Standard length barrel?
    low charge level too for the weight. VV data shows 48 as the starting point for 100gr up to 52.3gr

    the flames and sooty neck are not necessarily from the same issue
    I have had lack of obturation from very hard brass and medium charge levels (also lapua)

    I have also had flames belching from the muzzle on N160 (56gr under 130gr SP in .270).....dont see the issue myself, looks cool in the half light!



    http://www.lapua.com/en/products/rel.../relodata/5/56
    Last edited by bewsher500; 03-08-2013 at 18:23.

  9. #9
    might've known you would bloody show up on this Nicholas!! it certainly shoots though nick, I reckon it would scare dave into submission :-p

  10. #10
    thanks guys, it doesn't actually bother me but I wondered if I would be wasting my time using the heavier charge weights if its not burning everything. suppose I should just grin and crack on. may just try them the next time I go out and see what happens to the grouping.

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