Fixed two issues with bullet hit chance.

- Bullet hit chance was too low at close distance
- Missing wouldn't actually prevent the damage

code/modules/mob/mob_helpers.dm

@@ -165,12 +165,13 @@ proc/hasorgans(A)
 
 // Emulates targetting a specific body part, and miss chances
 // May return null if missed
+// miss_chance_mod may be negative.
 /proc/get_zone_with_miss_chance(zone, var/mob/target, var/miss_chance_mod = 0)
 	zone = check_zone(zone)
 
 	// you can only miss if your target is standing and not restrained
 	if(!target.buckled && !target.lying) 
-		var/miss_chance = 10 + miss_chance_mod
+		var/miss_chance = max(10 + miss_chance_mod, 0)
 		switch(zone)
 			if("head")
 				miss_chance = 40

code/modules/projectiles/projectile.dm

@@ -80,11 +80,13 @@
 				forcedodge = 1
 			else
 				var/distance = get_dist(original,loc)
-				//Lower accurancy/longer range tradeoff.
-				def_zone = get_zone_with_miss_chance(def_zone, src, 3*distance)
+				//Lower accurancy/longer range tradeoff. Distance matters a lot here, so at
+				// close distance, actually RAISE the chance to hit.
+				def_zone = get_zone_with_miss_chance(def_zone, src, -30 + 8*distance)
 
 				if(!def_zone)
 					visible_message("\The [src] misses [M] narrowly.")
+					return
 				if(silenced)
 					M << "\red You've been shot in the [def_zone] by the [src.name]!"
 				else