Alternate d20 Firearm Damage
Note: Everything in red definitely needs work for some reason or another.
This list doesn't reflect the wide variety of rounds out there, and it may not even reflect what's in the d20 Modern Weapons Locker, but it does reflect what I've seen in games, or at least the dimensions of bullets I'm familiar with that I've been able to obtain.
Handgun/Submachinegun Rounds
I arrived at the handgun dice size by dividing bullet diameter by 2 and rounding to the nearest where possible, or adding minimum damage to a smaller size where that wasn't possible. In some cases, I rounded up and subtracted individual points due to not wanting massive minimum damage bonuses. Case Length compared to bullet diameter determined number of dice (except where dice needed to be converted to a different size)
.22 Short (5.6x11mm);2d2 damage
.25 ACP (6.35x16mm);2d3+2
7.62x25mm Tokarev;3d4+1
.32 ACP (7.65x17mm);2d4+1
.380 ACP (9x17mm)/2d4-1
9x18mm Makarov/9x19mm Parabellum;2d4
.38 Special (9x29mm);3d4+1
357 Magnum (9x33mm);3d4+2
.40 S&W (10x21mm);1d8+2 (originally would have mapped out to 2d5, but there is no d5, plus knock down power, why not?)
.45 ACP (11.43x23mm);2d6
.44 Magnum (10.9x33mm)/.454 Casull (11.43x35mm);3d6
.45 Long Colt (11.43x33mm)/3d6-1
.50 Action Express (12.7x33mm);2d6+3
Shotgun Rounds
I found that Length/Diameter was a bad measure of shotgun damage, since the bigger diameter would produce less dice across the same length of round. So in order to preserve the inverse relationship, I used 60/gauge for dice type, and calculate the number of dice based on the Diameter/Length ratio.
I'm looking for a better system for shotguns.
32-gauge (12.5x70mm);2d6
20-gauge (15.6x70mm);3d4+2
16-gauge (16.8x70mm);4d4
12-gauge (18.5x70mm);4d4+2
10-gauge (19.7x73mm);4d6-2
Rifle Rounds
Some of these rounds are inverted for convenience. Rounds that I happen to know are "necked down" to their diameter don't use half their diameter to determine dice size.
5.56x45mm NATO;8d6
.22 Long Rifle (5.7x16mm);3d4-1
.22 Magnum (5.7×27mm);3d4+2
.30 M1 Carbine (7.62x33mm);2d8+3
7.62x39mm;5d8+1
7.62x51mm NATO/.308 Winchester/.30 Remington (actually 7.62x52mm but damage doesn't change much);7d8-2
7.62x54mm Mosin-Nagant;7d8
30-06 Springfield (7.62x63mm);8d8+2
.300 Winchester Magnum (7.62x66mm);9d8-2
.300 Remington Ultra Magnum (7.62x72mm);9d8+3
.32 Long Rifle (7.92x24mm);3d8
.338 Lapua Magnum (8.6x70mm);8d8+2
.40-90 Sharps (10.2x67mm)/.44-90 Sharps (11.3x61mm);5d6+2
.45-70 Springfield (11.43x53mm);4d6+3
.450 Martini-Henry (11.43x59mm);5d6+1
.450 Gardner-Gatling (11.43x63mm);5d6+3
.45-110 Sharps (11.43x73mm);6d6+2
.50 BMG (12.7x99mm);8d12-2
I don't have a clue whether the marked rounds are "necked down" or not.
Cannons
Most cannons exceed 24mm, so using Diameter/2 for dice type isn't practical. Instead, cannon loads that exceed 1" can be expressed as multiple d12s.
http://www.beartoothbullets.co...m?v1=8&v2=2876.1 suggests that an 8 inch lead ball is 110 lbs. I've seen somewhere that 100 lb shot does 10d12, so it would be pretty reasonable to assume that cannons deal 2d12x(Inches of Dameter) as long as the powder charge is approximately twice that.
I basically made this up. I'm open to suggestions.
Grenade Launchers
Grenades commonly fired from launchers are calculated both using the approximate diameter compared to 1" multiplied by Case Length ratio were possible. If not, whatever was available was used.
I basically made this up. I'm open to suggestions.
40x53mm;2d12+1
RPG-7 (93mm); 4d12-1
This message was last edited by the player at 01:03, Sun 14 Dec 2014.
