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So... any anti-tank weapons are going to have a hard time making their points back. Stuff like autocannons, normally a very safe pick, will find themselves swamped too. Even stuff like heavy bolters...

You could always keep some in reserve and have them walk onto the board later. Having your entire deployment zone full of guys is intimidating enough, imagine if on turn 2 more started to walk on!
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Honestly, if I knew I was coming up against a list like this then you'd be seeing a lot of monofiliment artillery on the field. Even then I doubt it would be enough.

Maybe 3 hemlock wraithfighters...

This I like. I'm not sure my 1750 list would be able to kill that many models in 5 rounds.

Welp, there goes the plan for tying up the enemy in a neverending wave of conscripts :(

My "mathhammer" was pretty much absolute worst case scenario. Once you start factoring in cover, range, line of sight, and the fact that most armies aren't exactly built for cutting down endless...

Is it possible to create a list containing more models than it is possible to kill in a 5 round game?

Let's set some parameters:
both sides are 1,500 points.
All rolling is assumed to conform...