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My list did a number on necrons

 Karhedron wrote:

 mrhappyface wrote:

 Karhedron wrote:
Go infantry-heavy. Battle cannons are are not really optimal for killing Marines.

Not true. In practise, battle cannon russes will tear infantry units a new hole. Saying that, it only takes one infantry model to make it into cc to lock down a tank for the whole game.

Battlecannon gets D6 shots so an average of 3.5. Hits on a 4+ so 1.75 hits. Wounds on a 2+ so 1.49 wounds. AP-2 so the Marine gets a 5+ save so 0.97 Marines killed. Marines are single wound models so the D3 damage is wasted and does not spill over. So a Battlecannon will kill on average 1 Marine per turn, not exactly terrifying. You will probably get a better kill rate from the heavy bolters.

The average is 0.97 but with a standard deviation of 0.96 In this edition is really important to look at the distribution.

0. 0.37
1. 0.37
2. 0.18
3. 0.06
4. 0.01
5. 0.00
6. 0.00

With three russes in the table you are going to see a few 2 and 3 kill results (but 0-1 should be the bulk of them)

Is OP's friend rolling the D3 damage and having it spill over like mortal wounds? That would be significant.