Algodoo

give this a long barrel and make the bullets resititutoin (bounce) at 0 and make barrels mass at 60kg

to make it more accurate (sorry for cut off comment)

Thanks for your comment!

I tried it when I made it, and it changes nothing. Here the problem is that the bolt begins to go downwards BEFORE the spring disappears. If the bullet's spring was destroyed in the the horizontal movement of the bold, the ammo's trajectory would be aligned with the barrel and every shot would hit in the same place.
A very simple way to fix this is to extend the horizontal part of the bolt's rail.

But this problem has an advantage: the bullet goes higher, so it increase the range


I'll probably fix it in a better version of this shooter concept.