Light primer strike 12 gauge?

Thanks for replies. The gun is not old at all, it is almost new, has fired about 150+ rounds and did not have this issue before. One thing is, I have never shot with this ammunition before. One type was self loaded ammunition, another box was not bought by me and was brought by another person. I have to try different ammunituion first.

I agree.  Too much head space.  Some Turkish guns are not all that good.

The pencil test is on the level of folk lore. Probably originated with a gun shop when sales were down and this uncontested test was given when a person could not prove otherwise at that point in time. There`s simply too much headspace when activated with the pump action. 

The age of the gun has to be taken in consideration and the wear factor as well.

 You may think you are pushing the shell in by hand as far as the bolt does but chances are you`re not is why the firing pin dents the primer more by hand loading.

Sounds like gunsmith time for someone that does not fix their own which conflicts the action I would take for my personal firearm. 

If the bolt face is not in full contact with the base of the shell, the firing pin may not be able to travel far enough to fully strike the primer. There may be too much lash in the pump mechanism that does not throw the bolt forward enough when the handle is pushed forward during the reload cycle.

Maybe you need to use Turkish ammo in it, or have a gunsmith work on it a bit.