​​Because i dont. Played 5 matches with various bolters and they are still weak. Maybe its just me. What you think?

Not sure what you think to expect wiht a 10% damage increase.

i know they increased the base damage, but it still isnt enough because most weapons rely on a headshot multiplier

Yeah, it's definitely a step in the right direction, but, the Bolter buffs still don't feel like much. Especially considering how spongy the enemies get on higher difficulties.

No. As has been covered by others, the damage values are actually all very small internally, so when you buff those by 5-10%, the increase is basically 0 damage. 

The Auto Bolt Rifle, for example, was dealing 1.4 damage per shot, with a 1.0 headshot multiplier. Its damage was raised 20%. That means its damage was raised to 1.6, maybe 1.7 damage. That's nothing. And that was the largest buff they gave anything.

No, the buffs were fluff to see if they could get by on placebos. Basically, they think everyone playing is an idiot and that their goalposts were just fine, and they want to keep using their original values. It's a part of the patch that's not even worth addressing. It's all marketing with no substance. A couple of weapons might see their required shots and TTK shrink, but by such a tiny value that you won't notice unless you imagine it's better.

Yeah I have to second this. All bolt weapons are still too weak.

The issue isn't damage, its enemy reactability. you feel like they are weak because there is no difference in enemy fresh state and enemy near death state. it makes your weapons feel weak.
Rubrics are the worst offenders as they do not react to being shot at at all.

Double the bolter base damage, and shrink the magazine/total ammo by 25-30%.

+15% to my lovely Heavy Bolt Rifle isn't enough. I could barely feel the difference in Substantial & Ruthless.

+1