1-2 Extra Chained Energised Hits and 2.5-10% Impact on Energised Hits.
7.5-15% Weak Spot Damage. Weakspot Kills also ignore Enemy Hit Mass.
Target receives 1-4 Stacks of 2.5% Brittleness on direct projectile hit. Debuff lasts for 5 seconds and can have a maximum of 16 stacks.
3.5-5% Critical Chance for every 10% of magazine spent during continuous fire. Stacks 5 times.
Boltgun will one-shot almost everything on headshot. Chosen blessing are to significantly increase damage against monstrosities, which in my experience are what most often ends an auric run with randoms. Save kraks against bulwark/crusher patrol.
Use hip fire (single click) against close targets.
NEVER use it against poxwalkers/bruisers/bucketheads: this is what Power Sword is for.
Power Sword's heavy attack will one-shot mutant on headshot. Don't waste bullets.
Melee kills are what will reload your Bolter most of the times. Don't hesitate to switch to it and immediatelly back to the sword while killing the horde. Point is to have Bolgun reloaded by the time you need it to kill a specialist/elite.
Use full auto ONLY against monstrosities, crushers and maulers, and still aim for the head. Can be used as a panic button against large group of ragers.