TL;DR version: Combat archery is working for all types of crossbows and bows. It was changed to no longer augment point blank shot and now simply applies +1[W] regardless of range.
I had heard that combat archery was working with crossbows but not bows. I hit level 27 last night and figured I was in a good position to test it. I picked up a heavy repeater, light repeater, great crossbow, heavy crossbow, light crossbow, longbow, and shortbow from the auction house and deconstructed each of them. I used blank sturdy deneith arrows and bolts for the testing. Four conditions were tested with each weapon:
without combat archery out of point blank shot range
without combat archery in point blank shot range
with combat archery out of point blank shot range
with combat archery in point blank shot range
In point blank shot range was me standing right in front of the airship dummy. The /loc command shows the following coordinates at that position:
r1 lx1121 ly876 i3 ox25.3 oy86.24 oz295.91 h260.2
Out of point blank shot range was me standing at the furthest point from which I could still target the dummy. My guild has the Stormglory Typhoon (the largest airship) and I was basically standing at the base of the ramp leading up to the navigator with the dummy at the other end of the ship next to the door that leads below deck. The /loc command shows the following coordinates at that position:
r1 lx1125 ly876 i3 ox100.51 oy85.77 oz299.18 h267.2
If I understand correctly, this means I was standing 75 meters from the training dummy, which is well outside of point blank shot range.
I unequipped all my gear, disabled all abilities, did not have any buffs, and killed the dummy before each trial. This was done on a level 26-27 artificer who is linked in my sig with all build details. He has the master engineer enhancement which grants a +3 enhancement bonus to any weapon. He also has all of the crossbow training enhancements from battle engineer which grant a total of +2 damage with repeaters, +6 damage with non-repeating crossbows, and nothing to bows. These enhancements result in a total bonus damage of +5 with repeaters, +9 with non-repeating crossbows, and +3 with bows. I have checked and rechecked and as far as I can tell, these should be the only extra damage.
I recorded 25 hits with each weapon under each condition, except for repeaters I counted 27 hits (since that was a full volley). I did not count misses and there were no crits. I then found the average of each trial and noted the lowest and highest hits for each. The sample size is probably not large enough for the averages to provide any definitive evidence, but I figured I'd calculate them anyway.
Listed below are the various weapon types along with their expected and actual damage under each condition. The first set of numbers is the base damage range including the bonus damage. The second set is the expected damage range on the dummy while helpless (base range x 1.5). The third set is the actual lowest and highest number from that trial. The fourth number is the average damage from that trial.
Heavy Repeater 1d10 base damage
(6-15) (9-22.5) (16-30) 21.63 without combat archery out of point blank shot range
(7-25) (10.5-37.5) (15-39) 27.81 without combat archery in point blank shot range
(6-15) (9-22.5) (25-42) 32.37 with combat archery out of point blank shot range
(8-35) (12-52.5) (27-55) 40.30 with combat archery in point blank shot range
Light Repeater 1d8 base damage
(6-13) (9-19.5) (16-27) 22.29 without combat archery out of point blank shot range
(7-21) (10.5-31.5) (13-31) 23.22 without combat archery in point blank shot range
(6-13) (9-19.5) (19-37) 28.37 with combat archery out of point blank shot range
(8-29) (12-43.5) (22-51) 36.59 with combat archery in point blank shot range
Great Crossbow 2d8 base damage
(11-25) (16.5-37.5) (28-37) 33.88 without combat archery out of point blank shot range
(13-41) (19.5-61.5) (28-55) 42.00 without combat archery in point blank shot range
(11-25) (16.5-37.5) (34-58) 45.64 with combat archery out of point blank shot range
(15-57) (22.5-65.5) (46-72) 60.44 with combat archery in point blank shot range
Heavy Crossbow 1d10 base damage
(10-19) (15-28.5) (22-36) 27.80 without combat archery out of point blank shot range
(11-29) (16.5-34.5) (22-40) 32.04 without combat archery in point blank shot range
(10-19) (15-28.5) (27-48) 38.48 with combat archery out of point blank shot range
(12-39) (18-58.5) (34-57) 43.48 with combat archery in point blank shot range
Light Crossbow 1d8 base damage
(10-17) (15-25.5) (19-33) 28.12 without combat archery out of point blank shot range
(11-25) (16.5-37.5) (21-40) 30.32 without combat archery in point blank shot range
(10-17) (15-25.5) (27-45) 35.32 with combat archery out of point blank shot range
(12-33) (18-49.5) (27-49) 39.48 with combat archery in point blank shot range
Longbow 1d8 base damage
(4-11) (6-16.5) (10-21) 15.24 without combat archery out of point blank shot range
(5-19) (7.5-28.5) (9-28) 18.08 without combat archery in point blank shot range
(4-11) (6-16.5) (12-31) 21.80 with combat archery out of point blank shot range
(6-27) (9-40.5) (18-40) 28.52 with combat archery in point blank shot range
Shortbow 1d6 base damage
(4-9) (6-13.5) (10-18) 14.16 without combat archery out of point blank shot range
(5-15) (7.5-22.5) (9-22) 14.80 without combat archery in point blank shot range
(4-9) (6-13.5) (13-25) 19.64 with combat archery out of point blank shot range
(6-21) (9-31.5) (16-33) 25.16 with combat archery in point blank shot range
So I'm having some trouble interpreting these results. In 20 out of the 28 trials, the highest actual damage dealt was higher than the maximum expected damage. This happened at least once in every condition. How can this be? Where is the extra damage coming from? As mentioned above, I have checked and rechecked and I should only be getting the bonus damage noted above. So what am I missing here?
Since I can't figure out why the damage is higher than it should be, it's difficult to draw any conclusions. But the huge damage increase with combat archery in point blank shot range compared to without combat archery out of point blank shot range, seems to indicate that combat archery is working for all weapon types and is stacking appropriately with point blank shot.
Another thing that stands out but doesn't quite make sense is that the results should be same in the conditions without combat archery out of point blank shot range and with combat archery out of point blank shot range, but they aren't. The damage with combat archery out of point blank shot range is clearly higher with every weapon type. The only explanation I can come up with for this is that combat archery is applying its bonus outside of point blank shot range. The feat description states that it adds to your point blank shot effect.
So I'd greatly appreciate it if anyone can help me draw some more definitive conclusions from all of this. I think the information I have included here is sufficient, but I can post the actual numbers for each trial if anyone would find that useful, just let me know.