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7.5x55 Swiss

Discussion in 'Rifle Country' started by dak0ta, Jan 31, 2012.

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  1. dak0ta

    dak0ta Member

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    Hi,

    I was wondering if there is a official load data that matches the GP11 cartridge. Anybody know where that is?
     
  2. Beak50

    Beak50 Member

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    I have looked for that myself and have come up empty.The closest thing is Hornady I think sst 150gr.I figure it must be the powder in the GP-11 cartridge.
     
  3. madcratebuilder

    madcratebuilder Member

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    Ask at the K31 forum at Gunboards.com or swissrifle.com.
     
  4. ball3006

    ball3006 Member

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    I have easily improved the accuracy of this round with current reloading data in loading manuals using pulled fmj bullets.....chris3
     
  5. CooterShooter

    CooterShooter Member

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    Last edited: Jan 31, 2012
  6. Slamfire

    Slamfire Member

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    Heck if I know an "official load".

    I conducted some load development for the 7.5 Swiss. I was given Swiss ball to shoot, pictures of the ammunition below.

    Notice that the bullet is greased. According to Gen Hatcher's Notebook, grease raises pressures "dangerously". I think that claim is bogus as evidenced by Swiss service ammunition.

    AA4350 gave excellent accuracy and just about duplicates Ball velocities with 51.0 grains and a 168 Nosler Match bullet. As you can see 52.0 grains produced velocities over Ball, so I do not recommend that load. It is here for reference.

    Instead of AA4350 I am shooting surplus WC852 in the 7.5 Swiss. This is a ball powder, and I purchased my lot from Jeff Barlett at GIBrass.com . It turns out Accurate Arms purchased a 90,000 pound lot of WC852, faster burning than Jeff’s lot, and now it is labeled as 2700. My lot of WC852 shoots extremely well, was dirt cheap, and I am using that up. But if I did not have the surplus powder, I would give IMR4350 or AA4350 a go as it shot very well.

    Code:
    [SIZE="3"][B]7.5 x 55 Swiss  Model K-31 [/B]AP11 Swiss Ball headstamp DA 78						
    24 Mar 04 T = 70 ° F								
    					
    								
    Ave Vel =	2565				 	 		
    Std Dev =	11				 	 		
    ES =	23				 	 		
    Low =	2551				 	 		
    High =	2574				 	 		
    N= 4
    
    168 gr Nosler Match  51.0 gr AA4350 INDEP brass and primer OAL 2.850		
    22 Dec 01 T = 58 ° F								
    Ave Vel =	2536					 		
    Std Dev =	17					 		
    ES =	45					 		
    Low =	2510					 		
    High =	2555					 		
    N=	9							
    								
    								
    168 gr Nosler Match  52.0 gr AA4350 INDEP brass and primer OAL 2.850		
    22 Dec 01 T = 58 ° F								
    Ave Vel =	2624							
    Std Dev =	31							
    ES =	72							
    Low =	2588							
    High =	2660							
    N=5[/SIZE]
    IMG_1567.jpg
     
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