How should I do this?

[Anza]

Lower Marksmanship Skill also makes your Quick Draw essentially useless which means no helping on sleeps, dispels, or boosting elemental WS damage/dealing instant 200+ damage.

Completely false. QD damage/accuracy is not in any way based on Marksmanship skill. Since the September 2010 update, you can get skillups with QD, but marksmanship doesn't change your damage or resist rate.

I don't know a single THF or DNC who will agree with you about evisceration being a better dagger outside of Abyssea, let alone better than Slugshot/Wildfire.

Wildfire is still good outside of Abyssea, even though it loses a LOT without Atma to assist in damage (and isn't reliant on Marksmanship skill anyway). But if you don't have WF...

We don't have THF and DNC's other dagger WS options. So we're just talking about what COR has access to, so Slug/Det/Leaden/Evisceration as legitimate options. And yes, Evisceration IS better than Slug outside of Abyssea in my experience. Plus, you won't ever completely miss Evisceration. I honestly prefer Leaden Salute (where Marksmanship skill is irrelevant anyway) over Slug/Det these days. I use it with a Pluto's staff when I do more of a buff focus on nasty AoE mobs I don't want to get to close to. If it's something I don't mind meleeing, I'll simply use Evisceration for better numbers than any of the other non-WF options.

As to the concern of gil that should be a non-issue if it is there is a problem. Between Sea Daughter and the fact that a decent EXP group inside abyssea runs at least 100k Cruor/hr which converts to 250k gil you should be making a good profit just fro EXPing. You make even more gil if that group is doing Dominion Ops with the gil you could get from the augmented weapons(6.5-7.1k).

Spending money on decent ammo for Abyssea exp alliances is a colossal waste. If you have WF, you can use it as your WS and use cheap bullets since it isn't affected by bullet DMG. If you don't have WF, you're better off using crit atma and Evisceration, which will EASILY outdamage Slug/Det/Leaden and doesn't cost a thing. Just because you can make money on Dom Ops parties by NPCing stuff doesn't mean it's a good idea to waste money on bullets for an alliance that's likely full of gimps, AFK-ers, and leeches. I'll keep my ammo for when it matters and make even more money. In most Abyssea EXP alliances I've ever joined as COR, I end up tanking the majority of mobs just through melee damage and Evisceration.

The point of shooting in Abyssea is on nasty NMs with bad AoE where you want to stay out of range and get TP. But really, feeding TP with /ra and Triple Shot is not that helpful. You're probably better off buffing your party, using lots of regain/MAB atma (meaning Atma that aren't helping your normal /ra at all anyway), and firing off QD and Wildfire/Leaden when you have TP.

I don't mean to discount the usefulness of keeping your skills capped, but let's not overstate the importance of Marksmanship here. It's pretty situational these days. Better to have than not, but if I was a 90COR with underleveled dagger/marksmanship skill... I'd work on dagger first.

[Mirabelle]

Excuse me but how did Evisceration get better than Slug outside of Abyssea? Admittedly I've not tried it recently but I recall most of my slugs doing about 1.5-2K damage and Eviscerations doing 800-1k damage on piercing weak mobs back in the days before Aby and level cap increases. Looking at the available gear for COR it seems we've gotten a lot of RATT/RACC gear and not so much ACC/ATT/DEX gear.

Is it simply the increase in dagger skill or a change in the damage ratings of daggers that has brought Evis up?

[Zagen]

Is it simply the increase in dagger skill or a change in the damage ratings of daggers that has brought Evis up?

I'm interested in this as well because that isn't the case for my COR. Though I'm suspecting the fact Anza favors Leaden Salute means it has to do with his marksmanship skill level, gun choice, bullet choice, or a combination of the 3.

I doubt it would be the damage ratings, the best DMG dagger for COR is Verus Knife +1 atm which has a DMG of 42, so the weapon rank would be 4 compared to Jambiya +1's (best DMG at 75) 34 DMG giving it a weapon rank of 3. So there is a slightly higher fSTR cap dagger can reach for COR. As to the Skill, or extra Attack which is what it boils down to really, is giving you 76.5 Attack. So less than the difference between using Attack food and not. Again not enough to boost Evisceration to the damage of Slugshot.

On paper and my implementation doesn't show Evisceration > Slugshot so I'd love to see what I'm missing to make that a true statement.

[Anza]

I'm interested in this as well because that isn't the case for my COR. Though I'm suspecting the fact Anza favors Leaden Salute means it has to do with his marksmanship skill level, gun choice, bullet choice, or a combination of the 3.

I have capped Marksmanship and 4 merits, an Ice Mayhem+2 (DMG:51 MAB+10), and I use Steel Bullets for Slug/Det. Yes, something like a STR or AGI Mayhem +2 would be better for Slug, but I'm more inclined to stick with the MAB gun for Quick Draw. I'm not using garbage gear and gimp skills though.

And obviously, this is a moot point if you're using a Wildfire gun, since you should just be using WF anyway.

I doubt it would be the damage ratings, the best DMG dagger for COR is Verus Knife +1 atm which has a DMG of 42

Augmented Yataghan can get up to DMG:43 with DMG+8 augment.

My Evisceration set looks like this:

Main: Yataghan (DMG:43, Crit DMG+3%)
Sub: Twilight Knife
Head: Anwig Salade (WSAcc+15/STR+4, Acc+10/Atk+5)
Neck: Shadow Gorget
Ears: Brutal/Aesir
Body: Loki's Kaftan
Hands: Navarch's Gants +2
Rings: Epona's/Rajas
Back: Atheling
Waist: Shadow Belt
Legs: Tumbler Trunks
Feet: Rager Ledelsens

Perhaps the fact that I have a pretty solid amount of DA/TA/QA (Twilight Knife, Brutal, Epona, Atheling) and crit gear (Yataghan, Loki's, Nav+2 hands) makes me more positive about Evisceration than some people, because extra hits and more crits sure does help the WS. Also, when I'm using crit atma inside Abyssea as I often will be if I'm meleeing stuff (say, RR/Apoc, and one of VV/GH/Sanguine Scythe), that's obviously a huge benefit to Evisceration.

But perhaps I do need to test things outside of Abyssea again, as several people are telling me I'm wrong. I was feeling better about Evis than Slug when eyeballing some mobs while doing magian trials with friends (and it's even possible I wasn't capped Marksmanship then, but I wasn't far off), but I can't honestly say I've really been doing a lot of COR DD either ranged or melee outside of Abyssea these past several months. I could indeed be mistaken.

At any rate, perhaps it's correct that at least outside of Abyssea Slug wins. Even so, better WS numbers or not, I would still stand by my assertion that I'd work to cap Dagger before Marksmanship in today's FFXI. I simply find more utility in more situations for being able to effectively melee for fast TP than I do for shooting for TP. When it comes time to WS, even if you're not capped on Marksmanship you have other legitimate options with Evisceration, Aeolian Edge (great for amber light), Leaden Salute, and even Detonator (since it's less likely to miss).

I think we can all agree that capping both skills is the ideal solution, but if you're prioritizing, I'd just do Marksmanship as a lower priority than Dagger.