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Message: <blockquote data-quote="Celebrim" data-source="post: 6897649" data-attributes="member: 4937">Most of this can probably be extrapolated by looking up the weight of the high explosive charge in the weapon you are stating out.  Wikipedia and Yahoo! have a lot of the answers you are looking for.Each 8 fold increase in weight presumably doubles the range of the weapon.   For instance, a 155mm round contains about 100 times (12+ lbs) as much explosive as a grenade (2 oz).   So the blast radius is going to be at least 4 times as wide.   A grenade has a blast radius of about 15 feet, and throws random shrapnel over a radius about 45 feet.  So we'd expect a 155mm shell to have a blast radius of at least 60 feet, and to throw shrapnel at least 180 feet.  Looking at the numbers, the military suggests that 50% of persons within 150 feet of a 155mm shell detonation will sustain serious injury, and puts the safe distance at 300 feet.If you want high accuracy you are going to need to be more granular than your table is, but...Presumably, a grenade would be something like - Step (2d6+6, Ref DC 18/save for half)/Close (1d6+3, Ref DC 16/save negates).And a 155mm HE round would be something like - Close (8d12+24, Ref DC 22/save for half)/Short (4d12+12, Ref DC 20/save for half)/Medium (2d12+6, Ref DC 18/save negates).  Note, if you don't mind being as unheroically lethal as modern weaponry actually is, you might also have a Step range on the 155mm of 16d12+48 no save allowed unless you have at least 90% cover.  This lets you realistically deal with the damage to structures and other objects.Above assumes you are using typical D20 hit point based injured system.</blockquote>

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