HERSHEY, April 23—dNS—Charges and counter-charges flew ‘today in the fourth day of the Hershey Chocolate Corporation strike, but no settlement of the wage dispute was in sight. “Both the company and _ the pickets are still in business,’’ re ported Company Attorney Gilbert Nurick. Plant Manager Samuel Hinkle said some union workers returned to their jobs today after inquiring about a company wage offer. He said a seven-cent hourly in crease retroactive to January 1 and a two-year contract with an addi tional five-cent boost next January 1 was offered during negotiations two months ago. Union officials, asking a 13-cent hike and a union shop, denied the offer was made. “Even had the offer been made, it is not satisfactory,’’ declared John O. Shearer, president of the AFL-Bakers and Confectioners un ion. Hinkle said three shifts are being maintained with about 1,000 work ers, including 200 supervisory per sonnel and some farmers who sup ply milk for the chocolate firm on a contract basis. Hershey normally employs more than 3,000 production workers.