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23 kills in Commandos.

-kills 9 during nighttime raid on command post (stabs a guy who's playing cards, shoots a guy climbing down a ladder with a suppressed pistol, stabs a guy sleeping in bed, throws a knife into the back of a guy going off to guard duty, and shoots 5 in the barracks firefight)
-strangles the Nazi officer who survived the initial raid described above
-shoots 3 during truck chase
-kills 10 during final shootout (shoots guy by car, shoots guy by trench, blows up a truck [killing 2 machine gunners on top and a guy standing in front], blows up another truck [killing 2 machine gunners on top], shoots guy who comes outta tank, shoots German professor guy, and blows up himself when throws a grenade at tank treads)

So, his tally so far is:

Sabata: 54
Blood Money/The Stranger and the Gunfighter: 27
Bad Man's River: 26
El Condor: 25
Commandos: 23
The Magnificent Seven Ride!: 18
Death Rides a Horse: 18 (MBC)
Captain Apache: 18 (Shobary)
Return of Sabata: 17
Day of Anger: 14 (Shobary)
The Big Gundown: 13 (Shobary)
Beyond the Law: 11 (Shobary)
The Grand Duel: 9 (Shobary)
For a Few Dollars More: 6
God's Gun: 6
Barquero: 5
Take a Hard Ride: 5 (MBC)
The Good, the Bad and the Ugly: 3
Armed Response: 2
The Big Combo: 1
Kansas City Confidential: 1
The Octagon: 1

Total: 303

Zero kills in High Noon, The Man Who Shot Liberty Valance, Escape from New York, The Naked Street, How the West Was Won, Gunfight at the O.K. Corral, The Bravados, Posse from Hell, Ten Wanted Men, The Conqueror, China Gate, and Tribute to a Bad Man.

Another Western actor broke 200!!!

Yeah, but Van Cleef isn't nearly as suprising to me as, say, Tony Anthony. I plan on counting George Hayes in the future (he was the sidekick in almost every western between the 30's and 50's).

18 kills in The Magnificent Seven Ride!.

-shoots 2 guys about to ambush McKay in opening scene
-shoots Gary Busey and the other guy that kidnaps his wife
-shoots 2 bandits in the seemingly-adandoned village
-shoots 3 bandits on the raid in the bandit hacienda
-shoots 2 bandits when they charge the village (I think he shoots a third, but I think he just wounded him and somebody else finished him off)
-kills 7 bandits when they enter the village (it looks like he kills two with one bullet at one part, but just counted one of the kills)

This brings his total to 239.

That makes it 5 possible videos.

1 kill in The Big Combo (pumps McClure full of lead with Mingo).

26 kills for Lee Van Cleef in Bad Man's River.

-shoots 1 guy during barroom shootout
-blows up 6 soldiers in the ammo depot
-shoots 13 guys during ghost-town shootout (could easily be 14, because one gets shot and it cuts back to Van Cleef staring at him, but his gun isn't aiming at him and Van Cleef had several buddies during this scene)
-blows up 2 soldiers when he raids the cannon
-blows up 4 soldiers in the tunnel (the tunnel collapses and there were a lot more soldiers behind them, but only four were explicitly shown being blown up/crushed)

Did Gianni Garko kill anyone in it?

Didn't even know he was in it. There's a very good chance he does, though, especially if he plays one of Van Cleef's gang members.

1 kill in Kansas City Confidential.