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Chrono Question

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Unread 08-11-2007, 01:57 PM
Silver Member
Join Date: May 2006
Posts: 288
Chrono Question

I just purchased my first chrono and have only been loading a couple months. I having some difficulty working up consistant loads with the 7 mm stw. But my question is i set it up about 10' from the muzzle. with 72.5 to 73 gr of IMR4831 and 140 TSX or Accubonds getting average of about 3180 fps. I know that should be faster just curious if the chrono is 10 ' away how much does it effect the muzzle velocity reading. This this makes any sense at all..
Member of the 7 MM STW Club
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  •   #2  
    Unread 08-11-2007, 06:28 PM
    Platinum Member
    Join Date: Jul 2004
    Location: Texas
    Posts: 7,001

    If you have a chronograph with a proof channel it will tell
    you what your loss per/foot is ,If not I would guess at your velocity
    your only losing about 8 to 10 ft/sec.

    I had to build a blast shield for mine because the shock wave would
    cause an error in velocities on some of the big bores unless I
    moved the screens way out.

    The blast shield is nothing more than a 2x4 frame with a piece of
    plywood 1/2x3'x3' with a 3''x6'' vertical slot at the matching height
    of the screens.

    The down side is more noise.

    Placed 3 or 4 feet in front of the muzzle,this allows you to set the
    screens 5 feet from the muzzel.

    The only other reason for setting the screens close is that it gives
    you a larger window to shoot through.(Multiple targets with out
    moving the screens.

    I hope this helped
    "PRESS ON"
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