I think the better approach is to refuse to use the anti-material rifle. I don't think more biters that are too easy to kill will make the game more fun, and if

I think the better approach is to refuse to use the anti-material rifle. I don't think more biters that are too easy to kill will make the game more fun, and if I increase their strength to the point that the anti-material rifle strategy doesn't work anymore, I don't think any other strategy will work either. I'll have a look at the Rampant mod, though. That looks interesting.