Welcome guest, is this your first visit? Create Account now to join.
  • Login:

Welcome to the NZ Hunting and Shooting Forums.

If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed.

Delta ZeroPak


User Tag List

+ Reply to Thread
Page 3 of 6 FirstFirst 123456 LastLast
Results 31 to 45 of 85
Like Tree67Likes

Thread: New Defence Force rifles need firing pins replaced

  1. #31
    Member
    Join Date
    Aug 2017
    Location
    King Country
    Posts
    2,429
    Quote Originally Posted by Danger Mouse View Post
    Facepalm. I knew units were struggling to get live rounds but didn't realise this. What a dick move. Ammo is the cost of going business. 55gr is probably too light for the twist rate too
    I very much doubt that a shot will ever be fired in anger. A paper target will never know the difference.
    csmiffy likes this.

  2. #32
    Member Micky Duck's Avatar
    Join Date
    Apr 2015
    Location
    Geraldine
    Posts
    22,365
    I struggle to see how the 55grn wont work just fine...it will be overstabalized so will be spinning much faster than it should making it more likely to do naasty things at business end... a fmj SHOULD stand up to the additional Gforces placed on it by the fast twist.... can anyone tell me WHY they wont work???? I understand a slow twist not making heavy stable enough but not the other way around....
    veitnamcam and 7mm300wby like this.

  3. #33
    Member
    Join Date
    Jan 2018
    Location
    kaiapoi
    Posts
    6,697
    Quote Originally Posted by Cordite View Post
    Well, better to find out in peacetime.

    - so what's the lock time of an AR15?
    African or European?
    Anyone?

  4. #34
    Banned
    Join Date
    Apr 2015
    Location
    Land of the Long White Cloud
    Posts
    1,001
    Quote Originally Posted by csmiffy View Post
    African or European?
    Anyone?
    Holy Grail
    csmiffy likes this.

  5. #35
    Member
    Join Date
    Aug 2017
    Location
    Timaru
    Posts
    713
    I got to try out the 308 version LMT 14.5” the local AOS got a year ago. They were brand new hadn’t been fired so I invited them out to break them in. Worked without any issues and were pretty accurate. Shot them out to 550 yards with the 1.5-8 mark 4 leupold.

  6. #36
    Member 300CALMAN's Avatar
    Join Date
    Dec 2014
    Location
    NZISTAN
    Posts
    5,215
    Quote Originally Posted by Micky Duck View Post
    I struggle to see how the 55grn wont work just fine...it will be overstabalized so will be spinning much faster than it should making it more likely to do naasty things at business end... a fmj SHOULD stand up to the additional Gforces placed on it by the fast twist.... can anyone tell me WHY they wont work???? I understand a slow twist not making heavy stable enough but not the other way around....
    My experience is that over-spun light bullets tend to shoot inaccurately, especial if low quality. I guess it's a bit like a badly balanced turbo...

    I am sure 55 gr will still work fine at normal combat distances but you want the extra weight of the 62-77 gr at longer distances anyway.

    I remember that the steyr had plenty of problems when new including breaking firing mechanisms.
    Micky Duck and rewa like this.

  7. #37
    Member
    Join Date
    May 2014
    Location
    Auckland
    Posts
    979
    Try shooting 55grs in a 1:7 twist, then 62's will start coming good and then 75 & 77s seem to be sweet spot.
    1:8 seem to shoot 55's ok, guess it all depends on your accuracy expectations and quality barrels like JP will probably group anything well.
    Beaker and Micky Duck like this.

  8. #38
    Member Max Headroom's Avatar
    Join Date
    Jul 2018
    Location
    Southland
    Posts
    4,124
    Quote Originally Posted by Cordite View Post
    Well, better to find out in peacetime.

    Speaking of firing pins, you AR15 afficionados. I suppose a lot of shots will not be squeezed off calmly using a bipod - so what's the lock time of an AR15?
    Between 2-16 milliseconds, depending what site on the net you read.

  9. #39
    Member Max Headroom's Avatar
    Join Date
    Jul 2018
    Location
    Southland
    Posts
    4,124
    Name:  ar 15 bullet weight.jpg
Views: 285
Size:  12.8 KB

    this is the best explanation twist v bullet weight that I have found.
    timattalon and planenutz like this.

  10. #40
    Member
    Join Date
    Nov 2014
    Location
    Christchuch New Zealand
    Posts
    5,842
    Quote Originally Posted by Max Headroom View Post
    Attachment 95449

    this is the best explanation twist v bullet weight that I have found.
    Well I can verify the findings in the Green circle....

  11. #41
    Member Beavis's Avatar
    Join Date
    Dec 2011
    Location
    Taupo
    Posts
    4,833
    55gr runs perfectly fine through a 1:7 Twist. Poor accuracy would be a reflection on ammo quality, the rifle, the shooter, or all three. 55gr M193 generally has excellent terminal performance at closer ranges too. It will fragment in soft tissue out to 150m or so. Years ago the defense force purchased some 55gr from FN that would spin apart after leaving a 1:7 twist, and it was consequently sold off as surplus.
    Banana likes this.

  12. #42
    Member
    Join Date
    Feb 2016
    Location
    NZ
    Posts
    297
    50gr Z-Max out of 1:7 18" @100m.......Eotech with magnifier.

    I know there are rules of thumbs and the military wouldn't waste time throwing such a light slug but never discount it for your own plinking. It might just work sweet.

    Name:  IMG_5160.JPG
Views: 272
Size:  1.78 MB
    Banana likes this.

  13. #43
    Member Max Headroom's Avatar
    Join Date
    Jul 2018
    Location
    Southland
    Posts
    4,124
    Name:  lucky gunner.jpg
Views: 206
Size:  112.2 KB

    Another point of view. I have a 1:7 twist rate in my NEA DMR, and found 50gn to group significantly better than 55gn.
    Banana likes this.

  14. #44
    Grant grunzter's Avatar
    Join Date
    Dec 2013
    Location
    Auckland
    Posts
    958
    I was shooting SA army 55g ammo in SA recently and I found it fine at 100m & not bad at 200m through a 1/7 16" barrel.
    When you get to 300m and 400m the groups noticeable start to open out, compared to SS109 62gr and similar ammo.
    omegaspeedy likes this.

  15. #45
    Member
    Join Date
    Feb 2016
    Location
    NZ
    Posts
    297
    Quote Originally Posted by grunzter View Post
    I was shooting SA army 55g ammo in SA recently and I found it fine at 100m & not bad at 200m through a 1/7 16" barrel.
    When you get to 300m and 400m the groups noticeable start to open out, compared to SS109 62gr and similar ammo.
    Absolutely, probably where the light stuff just runs out of energy and gets affected more by the elements.
    grunzter and Micky Duck like this.

 

 

Similar Threads

  1. Replies: 1
    Last Post: 16-07-2018, 12:16 PM
  2. NZ Defence Force to buy 82 new high-tech rifles for $4 million
    By systolic in forum Firearms, Optics and Accessories
    Replies: 117
    Last Post: 26-10-2017, 08:49 PM
  3. Broken BSA magazine springs, what have you replaced them with?
    By Tuidog in forum Firearms, Optics and Accessories
    Replies: 6
    Last Post: 01-01-2015, 08:44 PM

Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
Welcome to NZ Hunting and Shooting Forums! We see you're new here, or arn't logged in. Create an account, and Login for full access including our FREE BUY and SELL section Register NOW!!