I usually go with corrective measures and the ice breaker. I switch to ice breaker once i dump the whole 100 round drum into atheon as long as i have some left over for a venus portal. I dont have the raw data but i feel like i get more damage with corrective measures. I do around 500 to 800 a bullet and i can get 100 bullets on him. The void also helps smash that pratorian with plenty left over. Thats just my preference though. Gjallahorn is great.