Just to verify this isn't in fact a bug. You keep holding the fire button presses entire time right?
The bolt action is specific case where we wanted it to create high skill weapon that is difficult to use but rewards player with high damage. The best way to use is to release a trigger afer each shot and let recoil and accuracy to stabilise before you pull the next shot or the recoil penalties will stack. You can see how the scope returns close to original position after each shot and that's the best moment to pull the trigger. There is only 0.2s difference between keeping the trigger squeezed and doing it optimally.
That being said I just explain the intention behind it. It is quite easy to change and doesn't require a patch to do so however I've also seen voices from people who like this general idea so we have to look at this from various angles and consider various people opinion.