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.

Terminator Ammo Direct


User Tag List

+ Reply to Thread
Page 4 of 8 FirstFirst 12345678 LastLast
Results 46 to 60 of 109
Like Tree51Likes

Thread: Pressure / barrel speeds?

  1. #46
    Member BRADS's Avatar
    Join Date
    Oct 2012
    Location
    Central Hawkes Bay
    Posts
    9,544
    Quote Originally Posted by Happy View Post
    Sorry Brads I m confused now ,,, If Im right you saying just the one was over the safety mark. Yes agree you could get caught out.


    so did you pull and weigh one of the loads and it was ok within limits.. or ???

    Inattentive reloading could be dangerous for sure. Our machine has so far never had a fail or over beep. We check it and recheck it during the process but others may not for sure.
    I checked 3 or 4 that where all as the should be, the one in the photo obvisiouly wasn't
    The guy seemed very trustworthy and was a family man but people do funny shit like drinking while reloading, different powders out at once etc.
    Happy, Uplandstalker and Gibo like this.

  2. #47
    Member Uplandstalker's Avatar
    Join Date
    Nov 2012
    Location
    Souith Canterbury
    Posts
    1,794
    Quote Originally Posted by veitnamcam View Post
    Backed off half a grain and called it good?
    That's what I did to start with, shot a deer and then the bolt still would open that easy. Just as will the stag went down straight away!

    Backed off another half grain after that.
    veitnamcam likes this.

  3. #48
    AB Precision
    Join Date
    Dec 2011
    Location
    Nelson
    Posts
    2,209
    Quote Originally Posted by BRADS View Post
    Someone will no the proper answer but this is my basic understanding.
    Some of the longer double banded (Barnes pills?)create way more pressure than the same weight in other pills,
    Has caught a few out
    Other way mate likes of Barnes and gs custom projectiles with more grooves have less engraving pressure so can load higher go faster for same pressures.

    Gmx have a couple in them and nosler etips have none hard projectile engraves hard and puts pressure back up.

    Sent from my SM-G900F using Tapatalk
    BRADS and Gibo like this.

  4. #49
    Sending it Gibo's Avatar
    Join Date
    Feb 2013
    Location
    The Hill
    Posts
    23,480
    Quote Originally Posted by tui_man2 View Post
    Other way mate likes of Barnes and gs custom projectiles with more grooves have less engraving pressure so can load higher go faster for same pressures.

    Gmx have a couple in them and nosler etips have none hard projectile engraves hard and puts pressure back up.

    Sent from my SM-G900F using Tapatalk
    Thanks Abe that does make sense.

  5. #50
    Member
    Join Date
    Mar 2014
    Location
    Tauranga
    Posts
    3,001
    Quote Originally Posted by Gibo View Post
    Ok guys im trying to get my head around a few things.

    Firstly pressure. Why is it lighter pills in the same cal can use more of the same powder than heavier pills. Is it to do with resistance?
    How can this effect the case differently (pressure wise) ?

    Secondly barrel speed?? If someone has told me my barrel is slow (tikka) how could a magnum of same cal same (tikka) go any faster?

    Just getting my head around the basics of reloading so keen to learn. Hope these even make sense: D
    Heavier pills = bigger pills = more surface area touching the rifleing = more friction = more pressure

  6. #51
    Gone But Not Forgotten Toby's Avatar
    Join Date
    Sep 2012
    Location
    Wouldn't you like to know
    Posts
    11,099
    Here's some ejector marks I got in my 6.5-55ai. I have lapua brass now though so will see if I can go back to that charge of powder and not get the marks

    Name:  10388649_940388869305034_3967923538797557554_n.jpg
Views: 184
Size:  77.9 KB

    Edit: What you can't see also is loose primer pockets, Fresh primers can be put in by hand and knocked out just as easy. I did measure it but forgot how much bigger they were but it was by a bit
    Last edited by Toby; 14-08-2014 at 08:09 PM. Reason: adding
    Gibo likes this.
    VIVA LA HOWA

  7. #52
    Member HNTMAD's Avatar
    Join Date
    May 2014
    Location
    Wairarapa
    Posts
    2,833
    Quote Originally Posted by Smiddy View Post
    another sign is the roundness of your primer after being fired, compare it to a unfired round - it should look the same and not flat
    Disagree Smiddy, It should have a dent from the firing pin
    Hamish
    027 5422 985
    www.hgd.co.nz

  8. #53
    Sending it Gibo's Avatar
    Join Date
    Feb 2013
    Location
    The Hill
    Posts
    23,480
    Are those marks indented toby?

  9. #54
    Gone But Not Forgotten Toby's Avatar
    Join Date
    Sep 2012
    Location
    Wouldn't you like to know
    Posts
    11,099
    Yup, not just a shine but a small gouge
    VIVA LA HOWA

  10. #55
    R93
    R93 is offline
    Member R93's Avatar
    Join Date
    Feb 2012
    Location
    Westland NZ
    Posts
    16,102
    Trying to reach ..260 Ackley speeds eh?:p
    Do what ya want! Ya will anyway.

  11. #56
    Gone But Not Forgotten Toby's Avatar
    Join Date
    Sep 2012
    Location
    Wouldn't you like to know
    Posts
    11,099
    Quote Originally Posted by R93 View Post
    Trying to reach ..260 Ackley speeds eh?:p
    Was on a mission to get to 3000 with 140's haha dreaming of course but got close to 2,900. I think. I can check what my top speed was if you want?
    VIVA LA HOWA

  12. #57
    R93
    R93 is offline
    Member R93's Avatar
    Join Date
    Feb 2012
    Location
    Westland NZ
    Posts
    16,102
    I thought the 6.5 x 55 ai was faster than the .260 ai
    I get 2950 easy.
    What length barrel Toby?
    Do what ya want! Ya will anyway.

  13. #58
    Member Beavis's Avatar
    Join Date
    Dec 2011
    Location
    Taupo
    Posts
    4,891
    What kind of charge was that with Toby?

  14. #59
    Gone But Not Forgotten Toby's Avatar
    Join Date
    Sep 2012
    Location
    Wouldn't you like to know
    Posts
    11,099
    I'll start another thread
    Last edited by Toby; 14-08-2014 at 08:59 PM. Reason: Deleted, starting another thread, soz gibo
    VIVA LA HOWA

  15. #60
    Sending it Gibo's Avatar
    Join Date
    Feb 2013
    Location
    The Hill
    Posts
    23,480
    Quote Originally Posted by Nick-D View Post
    Heavier pills = bigger pills = more surface area touching the rifleing = more friction = more pressure
    Mmm not sure about that, different shaped pills have different surface area. The weight is the key.

 

 

Similar Threads

  1. Over pressure signs ??
    By kiwi39 in forum Reloading and Ballistics
    Replies: 17
    Last Post: 03-01-2014, 10:40 PM
  2. 22" tube .280 - realistic speeds?
    By Pop Shot in forum Firearms, Optics and Accessories
    Replies: 15
    Last Post: 20-04-2013, 01:33 PM
  3. Pressure.
    By CreepingDeath in forum Shooting
    Replies: 6
    Last Post: 02-04-2013, 12:26 PM
  4. 123 gr amax speeds. (6.5mm)
    By hamstring in forum Reloading and Ballistics
    Replies: 5
    Last Post: 21-11-2012, 07:37 PM
  5. 22.250 vs 22.250AI speeds
    By Spanners in forum Reloading and Ballistics
    Replies: 25
    Last Post: 02-09-2012, 11:30 AM

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!!