How to Jhin friends and influence people
Are you ready to lay waste to your enemies? Then here you go!
http://gameinfo.na.leagueoflegends.com/en/game-info/summoners/masteries/#Hp9qpVsjS.Y6ximqG0.0
2x AD/1x crit chance quints, 9x crit chance marks, 9x armor seals, 9x scaling magic res glyphs

Here's your stats at 18: Base AD: 113 Rune AD: 4.5 Item AD: 65+65+25+75 = 230 Total Base AD: 347.5
Crit Chance: 100% Bonus AS: 79%
AD Bonuses: Base 40% Crit 40% AS 19.75% Total Bonus: 99.75%
Total AD: 694
Total damage on 4th bullet with sheen (226) and firecannon (160) (Damage from masteries notwithstanding):
2,123 + 25% missing health Deathfire touch damage: 299 (W), 150 (Q/E) W damage: 645 Grenade damage: 507-1247 Trap damage: 1093
Strategy: rush the firecannon. From that point on, use every energized proc to harass your opponent. Do your best to make sure energized shots are 4th bullets. Also harass with W and max range bounce grenades. Use your traps defensively to prevent dives. Do not get into regular attack range of your opponent unless it's a sure thing (good jungle gank, etc).
Play like a cowardly sniper and kill the hell out of the other team. Don't be brave, be smart! Also, you might notice the cleanse instead of heal or other spells. As your goal is to not fight, you want to run away unless you know you will win. As such, removing CC is your top priority. Don't get caught!
On a related note, replace
with
as needed. The damage is identical; it's just a question of sustain vs slippery.
edit: forgot to put his ult damage!
Curtain Call damage: First 3 shots: 200+174 = 374 min 600+520 = 1120 max 4th shot: 935 min, 2800 max
Each shot spawns 4 sec deathfire for 300/4s, so each seconds is worth 75 damage. If all 4 bullets strike, deathfire touch will add approximately 525 bonus magic damage.
By the way, it is probably better to get armor pen quints than the two damage quints. 4.5 ad translates to about 23 damage on your 4th bullet. 5 armor penetration, on the other hand, is more like 100 damage.