7x55 swiss gp11

[Tallday 10]

Hi all.

I am shooting my first bolt action match Saturday. I will be using my k31 and gp11 surplus ammo. My problem is I have changed the rear sight since last time I shot it. I have no time to get to the 200 yard mark until the match. Lucky I get 5 minutes of sight in before the match starts. But I can get it to the 50 yard indoor range at GFH. I would like to know if sighting in at 50 yards what would be the difference when out to 200 with the point of impact of the 7x55 swiss? I know you reloading guys have a good knowledge of ballistics and could probably get me on paper.

Thanks for any help.

 

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[Jon 264]

Assuming sights are 1/2" off the barrel, a k31 shooting gp11 should drop roughly 7.5" at 200yds using quick and dirty numbers found online.

[Jon 264]

Also, I used the Hornady Ballistics Calculator(try google, having trouble hyperlinking) and found that GP11 fired through a K31 achieved roughly 2560fps and had a ballistic coefficient of .505 - .514.

[Tallday 10]

Thanks Jon. So I should zero about 5 to 7 inches above center at 50?

 

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[Jon 264]

Thanks Jon. So I should zero about 5 to 7 inches above center at 50?

 

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If you can measure the height of your sights over the bore you can get a bit more precise.

 

ETA: at 1" over bore, the numbers work out to 6", at 1.5" over bore, it's 4.5".

[Tallday 10]

I just used the sight you linked and put in some data found on the Web guessing that the sight hight would be around .5 inches .looks like if zero at 50 then -7.5 at 200.

 

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[Tallday 10]

So if I zero 7" above at 50 then should be close at 200 right? Then I can fine tune with my sight in time.

 

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[Jon 264]

So if I zero 7" above at 50 then should be close at 200 right? Then I can fine tune with my sight in time.

 

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Yes.

[Tallday 10]

Thanks ... This saved me a dozen or so rounds and some cuss words..

 

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