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Example: My Baneblade have range on the just the 2 lead Tactical marines in front on me. Now I shoot and cause more than 2 hits, are you saying I can kill more than 2 stands? Say if I hit 4, the 2 in range die and 2 more out of range die?
More like, your Baneblade is 29cm away from one enemy unit, and 31cm away from a second enemy unit.
Baneblade fires all its guns, but only 2 Heavy Bolters hit.
Heavy Bolters have a shooting range of 30cm. However, because the Baneblade also has some other longer ranged weapons (Like the 75cm range battlecannon) the range at which your hits can apply are 'stretched', allowing your second Heavy Bolter hit to be applied to the second enemy unit 31cm away, instead of both hits going on the first unit.
This happens because your total number of hits are pooled before being applied as one allocation block, and it is an intentional part of the rules system.
So,
You roll to hit what's in range (Range of each weapon system is checked)
Then you apply hits to all potentially affected units in one allocation block (Range of longest-range weapon is used to detirmine what units can be allocated a hit)
If you're rolling each weapon system on each unit individually and then allocating on an individual basis too then that's not how the rules are intended to work and you'll be playing a version of Epic with quite 'nerfed' ranged shooting.