Well, ignore the fibre optic insert on the front sight when it comes to distance and use the front/rear sight as as traditional sight.
Don't forget to chamber check your ammo using the barrel of the gun.
I double check my match ammo. First check using my Dillon guage and then in the barrel of the gun.
Sometimes it will pass throught the Dillon..but not throught the gun barrel.
Hope that things go smoother today.
Ciao.