Advice on correct impact point - open sights Thompson Black Diamond

Discussion in 'Black Powder Shooting / Muzzleloaders / Handguns' started by wpshooter, Nov 16, 2012.

  1. wpshooter

    wpshooter Member

    Joined:
    Jul 21, 2009
    Messages:
    310
    Can anyone give me some INFORMED advice (not just what you might think off the top of your head) about what would be the correct point of impact (i.e. ABOVE the 30 yard hold point) for a 30 yard sight-in range, if I want my Thompson Black Diamond Extended Range to be able to hit dead-on at 100 yards, IF I am using the open sights on the rifle which are fiber optic, red on front and 2 green dots on the back ?

    I have a great deal of experience in sighting in rifles that have scopes on them BUT I have practically zero experience with open sights on rifles. I am not going to have a scope on this rifle.

    I would be holding on the 30 yard sight-in target point with front red dot in horizontal alignment with the 2 back green dots (or at least the best I can hold them).

    Thanks.
  2. Buffalochip

    Buffalochip Active Member

    Joined:
    Oct 22, 2008
    Messages:
    1,101
    No one can give you an informed answer without the calibre, powder charge, and bullet weight, and height of sights above axis of bullet. At 30 yds. the bullet is on an upward trajectory because it has to rise to the level of the sight plane. Where it impacts down range depends on velocity and bullet aerodynamics/resistance. You may be able to find a ballistics table online for your particular gun, but to dial it in at 100yds. you need to take it to the range.
  3. wpshooter

    wpshooter Member

    Joined:
    Jul 21, 2009
    Messages:
    310
    Yeah, I thought about that on the way to my deer hunting spot this evening.

    I always shoot 90 gr. loose T7 and use 245 gr. areo-tip powerbelt.

    The sights on the Thompson Black Diamond are the ones that were supplied with the gun by Thompson.

    Thanks.
Similar Threads
Forum Title Date
Black Powder Shooting / Muzzleloaders / Handguns Some advice on sighting in my new Hawken Aug 13, 2013
Black Powder Shooting / Muzzleloaders / Handguns Need some advice. Dec 29, 2012
Black Powder Shooting / Muzzleloaders / Handguns Request for advice on proper sling installation - 1777 AN IX French Infantry Musket. Jan 21, 2012
Black Powder Shooting / Muzzleloaders / Handguns Looking for advice... Feb 19, 2011
Black Powder Shooting / Muzzleloaders / Handguns Cap & Ball Sixgun: Advice from 1930 Mar 13, 2010

Share This Page