Results 1 to 9 of 9

Thread: Damaged cases

  1. #1

    Damaged cases

    A friend of mine[honestly] has a Sako 75 in .308.I have seen him on the target and on the hill and the rifle shoots sub .75 groups with factory ammo.the interesting thing is that the rifle seems to crimp the bullet end of the fired cartridge.The crimping is not always uniform but is very noticeableThere are no powder marks on the case and the primer isn`t damaged.He doesn`t home load and these are all factory rounds.I have asked a few friends who home load to have a look and none of them know what is causing it.So anyone out ther got any thoughts .The rifle is ordinary in every way.Ammo used norma 150gr bt.

    Hummel

  2. #2
    SD Regular willie_gunn's Avatar
    Join Date
    Aug 2008
    Location
    Oxfordshire, Wiltshire, Berkshire....and Sutherland
    Posts
    6,995
    View my Gallery (19)View my Gallery (19)
    Hummel

    Any chance of a photo?? I also have a Sako 75 in .308 but have not seen this at all.

    willie_gunn
    O wad some Power the giftie gie us to see oursels as ithers see us!

  3. #3
    Hi Willie,
    Sorry don`t have the knowledge to post a pic!!It looks like the rim has been tapped with a small hammer folding it in 2-3 mil,sometimes on one side sometimes on opposing sides.The estate also has a 75 sako and i1ve never seen this before.I figure it must obviously happen after bullet sent up barrel as it happens where the bullet is crimped.Some form of gas blast back??No powder marks .Not an extractor mark either.!!!
    Shot thousands or rounds through many dfferent rifles and never seen this before.


    Confused Hummel

  4. #4
    SD Regular willie_gunn's Avatar
    Join Date
    Aug 2008
    Location
    Oxfordshire, Wiltshire, Berkshire....and Sutherland
    Posts
    6,995
    View my Gallery (19)View my Gallery (19)
    Hummel


    To be honest I'm also grasping at straws here, but:
    • has he had a gunsmith check the chamber at all?
    • Is he 100% sure it's not happening before the round is loaded? i.e. could it be something to do with the magazine?
    • If he just cycles rounds without firing, does he get the same result, or is it only when the trigger is pulled?
    Yours in desperation!

    willie_gunn
    O wad some Power the giftie gie us to see oursels as ithers see us!

  5. #5
    Hummel. I suspect that the case is damaged on ejection as the ejection blade is damaged/incorrectly postioned in some way. I had a Ruger 223 a long time ago and the ejection blade got bent. This resulted in non-ejection of the cases. The ejection blade needs to be examined by a competent riflesmith. Spookily I was removing fluff from the ejection blade of my Sako 75 this morning. Rgds JCS
    Last edited by jcampbellsmith; 16-06-2010 at 12:23. Reason: clarification

  6. #6
    Does it do this with all ammunition? Or just one brand? ~Muir

  7. #7
    Well chaps,I will try to give you more info.As far as i know it does it with all ammo,it`s not the ejector blade,no damage before firing,no damage in the mag,you can cycle rounds with no damage but when you fire the bloody thing it distorts the cases.
    As i said i`m at a loss.The owner is still happy to use it,and uses it very well!I took a case to a local gunsmith and he couldn`t say what was causing it.If i ever figure out how to post pics i will restart thread.

    Cheers and thanks for your comments Hummel Feel free to come back with any more suggestions.

  8. #8
    H. What happens when virgin empty cases are ejected? Have you any new brass, or fired cases from another rifle? Try cycling them. Also, can you have a close look at the bullet heads of live rounds that have been ejected. Do they show marks/scrapes? Following up on my earlier comment, it's not the ejector blade coming into contact with the case neck that causes the damage, but a poorly positioned ejector blade causing the ejection to mistime (early I suspect) and strike the inside of the action. Some photos would help. If it's not resolved, it should go back to Sako. It could be that an ejector blade from another model of Sako 75 has been installed by mistake. Sako 75s come in four different action lengths. Rgds JCS
    Last edited by jcampbellsmith; 17-06-2010 at 17:36. Reason: grammar - terrible and can't count

  9. #9
    Cheers JCS,
    I see what you mean,rifle is down south at hte moment but will check ejector when i next see it.

    Cheers Hummel

Similar Threads

  1. 243 cases 308 cases.what types????????
    By mick b in forum Ammunition, Reloading & Ballistics
    Replies: 11
    Last Post: 26-04-2010, 16:49
  2. used cases
    By mickjgardner in forum Ammunition, Reloading & Ballistics
    Replies: 1
    Last Post: 13-03-2010, 13:20
  3. USED CASES
    By the scudd in forum Ammunition, Reloading & Ballistics
    Replies: 2
    Last Post: 20-02-2009, 17:39
  4. Used cases
    By basil in forum Deer Stalking General
    Replies: 5
    Last Post: 22-01-2009, 06:43

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •