Galef wrote:But at the end of the day, without rules like SIA, a bolter shot is just a bolter shot. -
This.
SIA is the secret sauce that makes the Bolter Discipline go from good to great. To illustrate this, lets take some examples of bolters vs common enemies and see what the difference is.
I'll also add the values for a master and lieutenant nearby to cause rerolls of hits and wound values of 1.
MEQ
Chaos filth has come pouring onto the table. How much better is SIA vs that 3+ T4 save?
* Regular bolter : (2/3 to hit) * (1/2 to wound) * (1/3 failed save) =
11.11% chance to kill per shot.
* Master : (7/9 to hit) * (1/2 to wound) * (1/3 failed save) =
12.96% chance to kill per shot.
* Lieutenant : (2/3 to hit) * (7/12 to wound) * (1/3 failed save) =
12.96% chance to kill per shot.
* Both : (7/9 to hit) * (7/12 to wound) * (1/3 failed save) =
15.12% chance to kill per shot.
* Kraken SIA : (2/3 to hit) * (1/2 to wound) * (1/2 failed save) =
16.67% chance to kill per shot.
* Vengeance SIA : (2/3 to hit) * (1/2 to wound) * (2/3 failed save) =
22.22% chance to kill per shot.
* Hellfire SIA : (2/3 to hit) * (5/6 to wound) * (1/3 failed save) =
18.52% chance to kill per shot.
What does this tell us? SIA is better than vanilla marines having both a Master and Lieutenant standing next to them. If they are close enough to use vengance rounds, the SIA weapons are twice as deadly. That's the same as each terminator getting 8 shots with their
SB.
Horrors
Now lets see how these bolters would do against a swarm of 30 horrors.
* Regular bolter : (2/3 to hit) * (2/3 to wound) * (1/2 failed save) =
22.22% chance to kill per shot.
* Master : (7/9 to hit) * (2/3 to wound) * (1/2 failed save) =
25.93% chance to kill per shot.
* Lieutenant : (2/3 to hit) * (7/9 to wound) * (1/2 failed save) =
25.93% chance to kill per shot.
* Both : (7/9 to hit) * (7/9 to wound) * (1/2 failed save) =
30.25% chance to kill per shot.
* Kraken SIA : (2/3 to hit) * (2/3 to wound) * (1/2 failed save) =
22.22% chance to kill per shot.
* Vengeance SIA : (2/3 to hit) * (1/2 to wound) * (1/2 failed save) =
22.22% chance to kill per shot.
* Hellfire SIA : (2/3 to hit) * (5/6 to wound) * (1/2 failed save) =
27.78% chance to kill per shot.
SIA rounds still take the cake here. Even though the Kraken and Vengeance rounds are much less effective because the 4++ save nullies the modifier.
Orks
How do bolters do against the green tide?
* Regular bolter : (2/3 to hit) * (1/2 to wound) * (5/6 failed save) =
27.78% chance to kill per shot.
* Master : (7/9 to hit) * (1/2 to wound) * (5/6 failed save) =
32.41% chance to kill per shot.
* Lieutenant : (2/3 to hit) * (7/12 to wound) * (5/6 failed save) =
32.41% chance to kill per shot.
* Both : (7/9 to hit) * (7/12 to wound) * (5/6 failed save) =
37.81% chance to kill per shot.
* Kraken SIA : (2/3 to hit) * (1/2 to wound) * (1 failed save) =
33.33% chance to kill per shot.
* Vengeance SIA : (2/3 to hit) * (1/2 to wound) * (1 failed save) =
33.33% chance to kill per shot.
* Hellfire SIA : (2/3 to hit) * (5/6 to wound) * (5/6 failed save) =
46.30% chance to kill per shot.
SIA win again by a landside. I have seen this in action when my squad of 10 terminators teleported onto the table and opened up into a squad of boys kill ~20 of the mob.
Dreadnought
What about against a T6/T7 target with a 3+ save? There are lots of models that fall into this category.
* Regular bolter : (2/3 to hit) * (1/3 to wound) * (1/3 failed save) =
7.41% chance to kill per shot.
* Master : (7/9 to hit) * (1/3 to wound) * (1/3 failed save) =
8.64% chance to kill per shot.
* Lieutenant : (2/3 to hit) * (7/18 to wound) * (1/3 failed save) =
8.64% chance to kill per shot.
* Both : (7/9 to hit) * (7/18 to wound) * (1/3 failed save) =
10.08% chance to kill per shot.
* Kraken SIA : (2/3 to hit) * (1/2 to wound) * (1/2 failed save) =
11.11% chance to kill per shot.
* Vengeance SIA : (2/3 to hit) * (1/2 to wound) * (2/3 failed save) =
14.81% chance to kill per shot.
SIA again has double the damage output when you can use Vengeance rounds. This means 10 models with
SB should be able to throw nearly 6 wounds onto a Dreadnought!
I have personally seen this in action when my terminators where shooting down venoms and ravagers with bolters.
Takeaways
SIA is the secret sauce that makes bolters work. Bolter Discipline just ramps this up to 11.
Does that mean
DW are the overall-endall? I just flipped through my
DW book and there were 22 pages of units. I flipped through my
DA book and saw 50 pages of units.
DW lacks a lot of the tools that other marine armies have. Their infantry are head and shoulders better than the rest. If you are running a pure infantry list then they are the way to go.
If you want to do something different then there might be better solutions -- depending on what you are looking to do.