Game

[Imp]

Started on SPWAW but been a long time since I played, by more effective arty do you mean easier to use or hurts more? It was common for arty barrages to last over an hour (20 turns) before an attack so they had a chance to hurt the enemy thats why it was a big killer 2 turns worth wont do much vs infantry.
It should probably be more effective vs vehicles not destroying but making combat inefective as in striping tracks sight weapons a standard 155 shell landing within 30m of most vehicles even modern will do that.
Never heard of low carnage settings & cant remember exact numbers but in WW2 it took over a 1000 bullets to kill one person. Most shots were not aimed & MGs make up for the rest but I would say thats pretty low carnage & its why firefights especialy at range go on for a while most shots miss.
It was this realisation that caused everyone to adopt semi auto rifles over bolt action. Gets more of your squad activly taking part at least laying down suppresive fire letting the one or two good guys take aim.