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VELOCITY LOSS QUESTION - FOR FUN

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  #1  
Unread 01-30-2003, 03:24 PM
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Join Date: May 2001
Location: Sask. Canada
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VELOCITY LOSS QUESTION - FOR FUN

You take a brand new Winchester M-70 in .308 Win (24 inch barrel) and chronograph ten shots with Federal 168 match hollowpoints.

Velocities average 2674.

Ten inches of the barrel is cut off - down to 14 inches and recrowned - and the velocities are rechecked.

Lets see who can guess what the velocities would average. I have actual lab data of such a test - who can guess the closest?

Will give the answer after we have a decent response.
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  •   #2  
    Unread 01-30-2003, 03:48 PM
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    Re: VELOCITY LOSS QUESTION - FOR FUN

    Ian, what powder...Varget?

    I just checked some loads in my 14" barreled Striker with Varget and 165 SGK's. I thought it sayed 2550 but my dad pointed out that I needed to learn to read [img]images/icons/grin.gif[/img] ... it was 2250! I think it was 44gr. My dad said he was getting 2700 fps in it with 748 and 168 SMK, the same as in his 24" rem 700 VSS. I'm sure you found the same thing too. [img]images/icons/wink.gif[/img] They seem to do real well at holding speed in super short barrels for sure.

    I'll take a wild guess and say it was 2620?
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      #3  
    Unread 01-30-2003, 04:22 PM
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    Re: VELOCITY LOSS QUESTION - FOR FUN

    MY ANSWER TO THIS PROBLEM IS "2189FPS"
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      #4  
    Unread 01-30-2003, 05:08 PM
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    Re: VELOCITY LOSS QUESTION - FOR FUN

    Brent,
    Factory Federal match ammo, it is loaded with 4064 as a matter of fact.
    You sure you typed that correctly!?!?!?
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      #5  
    Unread 01-30-2003, 05:20 PM
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    Re: VELOCITY LOSS QUESTION - FOR FUN

    2425 or 2426 (I feel pretty confident [img]images/icons/wink.gif[/img])
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      #6  
    Unread 01-30-2003, 06:35 PM
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    Re: VELOCITY LOSS QUESTION - FOR FUN

    My dads crony sound like it's giving "fony crony" numbers again. [img]images/icons/grin.gif[/img]

    It would not surprise me if it was 2350-80 if you are using the Fed load which I believe is about 43.4gr of 4064. It goes about 2594 in my sons 20" tube. Dave could be right on though. The low number in my last test makes me want to say a little lower though.

    The 2620 guess is based on my "dads" observations in the Striker, probably at 47gr too, not exactly what I found with the load I shot though. I think this 44gr load just tested in the Striker was going about 2580 in the 20" tube.
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      #7  
    Unread 01-30-2003, 08:22 PM
     
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    Re: VELOCITY LOSS QUESTION - FOR FUN

    2344fps
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