PART 1 of 2 PARTS 02/07/1993, By Donald P. Baker, Washington Post Staff Writer RICHMOND, Feb. 6 - Lobbying from both sides on Gov. L. Douglas Wilder's one-handgun-a-month proposal intensified today as a Sunday showdown vote in a Senate committee approached. Hundreds of callers lit up the Statehouse switchboard, opposing TV commercials blanketed the capital city and lawmakers were pressured to take a stand on the dominant issue of the 1993 General Assembly session. The National Rifle Association is once again showing its masterful ability to bury lawmakers in form postcards and to keep their phones ringing with well-coached calls that have helped keep Virginia's gun laws among the least restrictive in the nation for decades. But this year, the Wilder administration has brought together a coalition of gun control advocates that is trying to match the gun lobby postcard for postcard, TV commercial for commercial, statistic for statistic in the campaign to reach voters and, through them, to influence their elected representatives. NRA lobbyist Charles H. Cunningham conceded today that gun control proponents have "made their case stronger" than in the past, but only because "they have conned the public into thinking that gun rationing will reduce violent crime." Wilder unveiled the plan in his State of the Commonwealth address three weeks ago to deal with Virginia's reputation as a leading source of guns for criminals in East Coast cities. Since then, the governor has talked about little else in his public appearances. His proposal threatens to overwhelm all 2,800 other bills introduced this session. The issue has even attracted the attention of comedian Jay Leno, who mentioned on Friday's "Tonight Show" that Wilder wants to limit handgun purchases to one a month. "After you get someone to sell you one gun," Leno joked, "you can pretty much get them to sell you another." Legislators couldn't escape the lobbying even when they returned to their hotel rooms and apartments this weekend, because both sides are blanketing Richmond television and radio stations with constant commercials. Carmela Bills, whose duties in the House clerk's office include answering telephones when legislators' offices are closed, said today that she is receiving "not hundreds, not thousands, but zillions" of calls, which she is dutifully recording on long yellow legal pads. "I just wish they'd take action," Bills said. "Pass it or kill it. But I have a feeling this will go on until the bitter end." Sunday's test comes in the Senate Courts of Justice Committee, where the outcome is much in doubt. Urban and suburban lawmakers are more likely to support the bill, and they outnumber rural legislators on the committee by 9 to 6. But there could be defections. Even if Wilder's proposal survives the Senate committee vote Sunday, it faces trouble on the Senate floor. A Republican alternative has the backing of all 18 Senate Republicans and three Democrats, which would be a majority of 21 in the 40-member chamber. The Republican bill would allow multiple purchases if the buyer got permission from local police. The Wilder proposal was approved by a House committee Friday. The full House will consider the Wilder bill Monday, with a final vote set for Tuesday. Wilder has predicted that his measure will slip through the House on a 52 to 48 vote; the NRA is publicly making no prediction. The lobbying on both sides has been well-organized and expensive. A bipartisan group, Virginians Against Gun Trafficking, has raised nearly $90,000 for television and radio advertising. One of the