Aperture Front Sight
A lot of National Match shooters shooting in the any rifle class use the obligitory aperture rear sight with a Merit or Gheman iris disk.
They also use an aperture front sight. Some have variable irises to adjust the inner diameter, but most use something like the Redfield sight that has interchangable apertures.
By using the aperture front sight, you maintain sight allignment by the target, the front sight and the rear sight in concentric circles. I still use a blade front sight as I shoot in the service rifle class, but I do have a bolt rifle with such a set up. Once I retire, it will become my match rifle.
I think this set up is best used on the range, but lots of guys can hit other targets pretty well with it too. Our back up sights for the M-24 SWS are a Redfield Palma rear sight and a Redfield aperture front sight. Both have the interchangeable apertures to taylor the sight picture for the individual shooter.
I think that you will find that you can see that target at long distance again if you try it.
Look for:
Redfield International Front Sight
Redfield Hi-Power Front Sight
Lyman 17A Front Sight
The 17A is much small than the Redfield products and looks pretty good on a lever action rifle, Sharps replica or other 19th Century rifles. It comes with several apertures as well as a blade for a service rifle sight picture.