On a single target the charge will do 1700-1800. Pretty ok but wont oneshot a trojan.

What you can do to get more damage is multiply the amount of mobs you hit with the charge.

The 5 normal bullets can hit more than one mob if you aim it well, so that doubles that damage from about 750 to 1500.
The owl attack has a huge wingspan and hits multiple times if you get it right on target, so you want to get as many mobs being hit by the centre of the attack as possible.

so an example of possible damage on a group of 5 slags in fsc(d24) would be this:

hit 2 zombies with the 5 initial bullets=(2x156)x5= 1560
hit the whole group with the owl dealing (5x310)x3 =4650
total damage=6210

Pretty good right? The best way to maximize this is to combine it with a vortex bomb so you can be sure to hit all the mobs without losing any hits caused by the knockback of the owl's wings.

Using the AP charge against Trojans is pretty silly since the Blitz deals the same damage but is effective vs Trojans and has a shorter animation, I think.

Yeah the trojan shield seems to block the owl, so you only get one or two hits with it.

If you charge attack at close range the owl wont knock-back properly, you cant really get more than 3 hits with it. If you use it at close range you'll likely get hit and the owl will knock the mob either sideways or actually behind you.

AP/Sent charges just aren't very good for single target damage. use it to do blanket damage and knock-back on big mobs like slags and jellies, and like I said above, combine it with an electron/graviton bomb to get the most out of it. The charge takes 5 seconds to perform from charge to reload, you can use two alchemer charges in the time it takes to use to you need to use it on immobile/slow enemies and make sure you wont be snuck up on by other mobs while its firing..

To clarify my damage calculation above: I'm not an expert on Argent Peacemaker. (I've had it for over two years, but I rarely use it.) I got my information from the wiki page, which says that the charge attack emits 5 shots, followed by the bird that hits up to 3 times. That's 8 hits total. In the damage table, there is only one value listed for charge attack damage. If the bird does more damage than the shots, then we should measure that and update the Argent Peacemaker wiki page as soon as possible.

Of course, it's not clear that you can land all 8 shots on a trojan. If the bird doesn't knock the trojan back, then the bird might hit only once? Listen to the other posters here. I was just trying to help you figure out whether one-shot-killing a trojan was possible. Good luck.