1. Attention: We have put together a thread with tips and a tutorial video to help with using the new software. Please take a moment to check out the thread here: Trapshooters.com Tutorial & Help Video.
    Dismiss Notice

POI ?

Discussion in 'Shooting Related Threads' started by 635 G, May 11, 2011.

Thread Status:
Not open for further replies.
  1. 635 G

    635 G Well-Known Member

    Joined:
    Jun 30, 2008
    Messages:
    6,219
    If a gun is pointing 9" high with a laser @13yrds how high will be @ 30yrds, 35 yrds?

    Thanx--Phil Berkowitz
     
  2. V10

    V10 Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    3,623
    Location:
    Mojave Desert
    21 inches and 24 inches, respectively.
     
  3. Hap MecTweaks

    Hap MecTweaks Well-Known Member

    Joined:
    Jan 29, 1998
    Messages:
    9,226
    Location:
    Mesquite, Nevada
    Phil, one must do a lot of assuming to use a laser for such POI. Chamber laser? End of barrel laser? Unless it fits the end of barrel perfectly, it's still guesswork because of geometry. The chamber laser, if the barrel is perfectly true and straight, more guesswork.

    Pattern your gun/load at 16 to 20 yards as you would sight in a rifle and you'll know exactly where your working pattern center is.

    Your dealing with the true pressure line of the shot down the barrel, if it's bent somewhat, all measurements are going to be off. Low to the barrel rib/bead, or one much higher than centerline of bore kinks the numbers also when using geometry alone. There isn't a formula that works for every situation for determining a true POI. The only way to know what it is for you and that gun is to do the work yourself and then you'll know.

    Assuming a whole bunch, the 9 inches high at 13 yards will be somewhat close to 27 to 30 inches high at 35 yards.

    Hap
     
  4. Pull & Mark

    Pull & Mark Well-Known Member

    Joined:
    Mar 9, 2006
    Messages:
    5,410
    Phil, if a gun is shooting 9 inchs high at 13 yards that is .692 inches per yard and multiply that by the yardage you are looking for 30 yards=20.76 inches high and 35 yards is 24.23 inches high. So Round if off like V10 said already. Break-em all. Jeff
     
  5. krieghoffkrusher

    krieghoffkrusher TS Member

    Joined:
    Jan 21, 2006
    Messages:
    298
    Do you need to factor the amount the shot drops as it loses energy in determing specific POI measurements or is it not a factor?
     
  6. Concrete200

    Concrete200 Member

    Joined:
    Feb 6, 2011
    Messages:
    54
    I would think the shot drop at that distance would be very small. The width of your shot pattern, depending on choke of course, will be around 24" so a half inch of drop (if that much) is not enough to consider.
     
  7. Rastoff

    Rastoff Active Member

    Joined:
    Apr 25, 2009
    Messages:
    1,319
    If the <I>laser</I> is 9" high at 13 yards, then what V10 said will be true for the <I>laser</I>, but not necessarily the shot pattern.
     
Similar Threads
  1. grunt
    Replies:
    7
    Views:
    410
  2. gordy h
    Replies:
    0
    Views:
    230
  3. djpk69
    Replies:
    34
    Views:
    2,204
  4. uncle chuck
    Replies:
    1
    Views:
    1,024
  5. capt kirk
    Replies:
    3
    Views:
    1,082
Loading...
Thread Status:
Not open for further replies.