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Bİg problem 7mm rem mag

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  #1  
Unread 01-06-2010, 10:22 AM
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Bİg problem 7mm rem mag

OK what the balistic programs say and some of you guys sugested was;
a 7mm rem mag shooting a 175 grain PSP bullet at 2860 f/s it would hit 4 inch high at 100 yards and dead on at 300 yards. but went shooting today at an altitude at see level and it was 4 inch high at 100 yards and 4 inch low at 300 yards??????? going back to the 150 grain bullets from now on. can any one sugest me a good scope with balistic reticals that suits the 7 mm rem mag???? thanks guys
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  •   #2  
    Unread 01-06-2010, 10:25 AM
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    Re: Bİg problem 7mm rem mag

    Is the 2860fps off the ammo box, or did you chony it for the speed.
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      #3  
    Unread 01-06-2010, 11:14 AM
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    Re: Bİg problem 7mm rem mag

    no a balistic program gave me that speed. the load is PMC 7mm Rem Mag 175 grain PSP. maybe thats not the speed. any ideas for a scope whith balistic reticals that suit 150 grain 7MM REM MAG? (not to expencive but good scope for long range)
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      #4  
    Unread 01-06-2010, 11:44 AM
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    Re: Bİg problem 7mm rem mag

    check your scope height and measure your velocity don't guesstimate
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      #5  
    Unread 01-06-2010, 12:43 PM
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    Re: Bİg problem 7mm rem mag

    I prefer the 160 grian Barnes Triple-Shock bullets out of my 7mm Rem Mag. They fly the best out of all the 7 Mags I've had. They don't make the exact ones I shoot anymore. Federal used to mass produce them, and they're part number is P7RK. You oughta check them out.
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      #6  
    Unread 01-06-2010, 01:16 PM
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    Re: Bİg problem 7mm rem mag

    Quote:
    Originally Posted by soundwaves View Post
    OK what the balistic programs say and some of you guys sugested was;
    a 7mm rem mag shooting a 175 grain PSP bullet at 2860 f/s it would hit 4 inch high at 100 yards and dead on at 300 yards. but went shooting today at an altitude at see level and it was 4 inch high at 100 yards and 4 inch low at 300 yards??????? going back to the 150 grain bullets from now on. can any one sugest me a good scope with balistic reticals that suits the 7 mm rem mag???? thanks guys
    Something is not right here. No way should your bullet should be hitting low @ 300 yds if you are 4" high @ 100 yds.

    A 175 psp should have a BC of at least .5 and using that and 2860 fps (which is a very reasonable guess of actual velocity) I am getting a 310 yd zero with bullets 4" high @ 100 yds @ 5000" elevation. I'm alos using 1.8" sight height.

    The 150's will shoot flatter.

    I think most BDC reticles are calibrated for about 3000 fps which should be close to factroy 150's.
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      #7  
    Unread 01-06-2010, 10:35 PM
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    Re: Bİg problem 7mm rem mag

    What's the best way to accurately measure scope height?
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