Balance - All weapons now have fire costs based on a % of max TU, rather than flat costs. The flat costs were an error on my part, as they were left over from some semi-related gameplay testing I did (X-Com and Xenonauts 1 both use %TU fire costs).
If you only have 50 action point, per turn, and it cost 25% to fire your weapon, it doesn't matter how good you improve your stats, it will always cost the same, so that would be 4 shots, with 50 points, and 4 shots with 100 point. It actually takes you longer to fire your weapon the better you get!! I just can't see the the benefit??