Steven Seagal ruled the Columbus Day holiday waves with his boffo sea-faring actioner “Under Siege,” blowing Gerard Depardieu’s new Columbus pic “1492: Conquest of Paradise” out of the water.Pushing Fox’s western smash “The Last of the Mohicans” into second, Warner Bros.’ “Under Siege” collected an estimated $ 14 million Friday through yesterday, with a projected four-day holiday weekend total of $ 17 million, per WB distribution honcho Barry Reardon. That would be the biggest October opening take ever, well ahead of the $ 12.1 million grossed by TriStar’s comedy “Look Who’s Talking” in 1,208 sites in the three-day weekend of Oct. 13-15, 1989. “Under Siege,” which was playing on 2,042 carriers, also had a shot at breaking the October weekend record of $ 14.1 million set by “Look Who’s Talking” in 1,547 spots during its second three-day sesh. The Seagal pic was expected to average about $ 8,325 over the four-day holiday period ending today. Paramount’s “1492″ sank quickly in its seventh-place opening as director Ridley Scott’s pic went the way of WB’s August dud “Christopher Columbus — The Discovery.” Pix having limited openings included Robert Redford’s period drama “A River Runs Through It” (Columbia), casting its line gracefully into 12 streams in seven markets, and Miramax’s comedy/tearjerker “Breaking the Rules,” DOA in 75 spots. “Mohicans” continued holding up beautifully, with an estimated $ 8.2 million for three days and about $ 10 million projected for the four-day weekend, per Fox exec VP Tom Sherak. That would push the extended weekend just ahead of its previous $ 9.7 million (three-day) sophomore frame. The Daniel Day-Lewis starrer was expected to average about $ 5,555 in 1,800 forts over the four-day holiday period, which would run its brisk 18-day cumulative to an estimated $ 37.3 million. Buena Vista’s kiddie hockey comedy “The Mighty Ducks” remained impressive, with industry sources estimating $ 6.7 million to $ 7.1 million in three days and projecting a four-day total between $ 8.2 million and $ 9 million. The Disney pic, which added 570 screens in its second cutup to play on 1,850, was expected to average between $ 4,325 and $ 4,865 for four days, which would run its sharp 11-day B.O. to between $ 15.8 million and $ 16.5 million. Col’s modest “Hero” cajoled an estimated $ 3.8 million over three days and an estimated $ 4.2 million in four during its second rescue, Col estimated. With a projected four-day average of $ 2,300 in 1,825 sites, the Dustin Hoffman pic would run its 11-day total to an estimated $ 10.9 million. ‘Baseball’ whiffs Universal’s Tom Selleck comedy “Mr. Baseball” whiffed in its second at-bat, with a meek $ 3.2 million estimated for three days and about $ 4 million to $ 4. 2 million forecast for the four-day period. With $ 2,145 to $ 2,250 per expected over four days on 1866 diamonds, the pic would advance its sluggish 11-day total to about $ 10.6 million. “Sneakers” (U) looked to be doing about $ 2.8 million over three days and around $ 3.5 million in four during its fifth hacking. Figuring in around $ 1, 950 per from 1,795 terminals over four days, the caper comedy would run its 34 -day total to a crisp $ 45.4 million. “1492″ sailed in with a not-so-hearty $ 2.3 million to $ 2.4 million in three days, Par estimated, with other sources projecting the pic at about $ 3.1 million to $ 3.3 million over the four-day holiday named for its lead character. The four-day average would be about $ 3,075 to $ 3,275 from 1,008 ships. By comparison, WB’s “Christopher Columbus — The Discovery” bowed with a fifth-place $ 3.1 million in three days Aug. 21-23 and has grossed just over $ 8 million to date. “A River Runs Through It” started sweetly with an estimated $ 265,000 on 12 screens in its first three days, or a projected $ 325,000 ($ 27,085 per) for four days. “Breaking the Rules” barely arrived with an estimated $ 23,475 for three days , or about $ 28,000 in four ($ 375 per). The Daily Variety weekend B.O. chart will appear in Wednesday’s paper with complete four-day holiday figures.