Returning to PS and have a few questions

[Nereid]

Do people find out these stats from testing in game or is their a website that shows the damage. I found that the 100mm cannon does 300 dmg and the 150mm does 450 dmg. Kinda makes since since 150mm is 50% bigger then 100mm so it does 50% more damage, does the same apply to the 75mm cannon, is it 75% the damage of the 100mm putting it at 225 damage? Really wanting to know the damage of the 35mm gun on the liberator, heard it can chew vehicles up better then the reaver rocket pods.