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`260rem holdover.

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  #1  
Unread 10-19-2009, 11:27 AM
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Join Date: Nov 2008
Posts: 10
`260rem holdover.

anyone have the holdover for `260rem using 47gns RL19 and Sierra Pro-Hunters at 2980fps over 100.150,200,250,300 and 350yds from a 20" barrel
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  •   #2  
    Unread 10-19-2009, 12:25 PM
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    Join Date: Oct 2007
    Location: Patagonia Mountains, Arizona
    Posts: 770
    Re: `260rem holdover.

    Quote:
    Originally Posted by 251120 View Post
    anyone have the holdover for `260rem using 47gns RL19 and Sierra Pro-Hunters at 2980fps over 100.150,200,250,300 and 350yds from a 20" barrel
    To calculate the "holdovers' you also need: height of the sights over the bore, the air density which comes from altitude, temperature, and barometric pressure, your zero range, the bullet BC, and muzzle velocity. You only gave muzzle velocity. The cartridge, barrel length, caliber, brand of anything and powder don't matter. The bullet weight only matters if you want to know bullet energy and momentum. Sierra gives G1 BCs for all of their bullets on their website.

    You apparently have a computer or you wouldn't be posting here. Why not run a ballistics program yourself? This is a good on-line ballistics program :
    JBM - Calculations - Trajectory

    That may seem like some work to fill out the form but without correct input numbers it's garbage
    in = garbage out. The output cannot be more accurate than what you input.

    JBM's site also has a list of various programs for various computer systems, both free and for purchase.
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      #3  
    Unread 11-20-2014, 03:48 AM
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    Join Date: Jan 2013
    Location: Denham Springs,Louisiana
    Posts: 464
    Re: `260rem holdover.

    Quote:
    Originally Posted by 251120 View Post
    anyone have the holdover for `260rem using 47gns RL19 and Sierra Pro-Hunters at 2980fps over 100.150,200,250,300 and 350yds from a 20" barrel
    Try 3-4 MOA. You should be close. My .260 with 123 A-Max @ 3000 + fps is exactly 3MOA up from 100 to 300. Hope this helps.

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