Thank you for the feedback
1) this might be difficult to achieve bcs now the collision check is much more accurate.
What this means is that often on the amiga the shot would be well inside the ship when collision is detected as the steps are longer for example 10pixels. But on PC due to higher refresh rate and more accurate collision checks a step might be 5pixels. And when a shot is more on the egde -> more shrapnel end up out side the ship and not cause damage.
So it would take some tricks to be more authentic. But I might do some trials.