Wheat hits 10-month high on reduced Russian crop outlook

* Wheat futures gained on decreased Russian harvest expectations

* Soybeans fall on pressure from cheaper South American soymeal

* Corn slips on improved U.S. planting weather

(New throughout, updates prices, market activity and comments; new byline, changes dateline, previous PARIS)

CHICAGO, May 28 (Reuters) -

Chicago benchmark wheat futures rose on Tuesday, supported by reduced harvest projections in Russia, hitting a 10-month high before paring gains on Tuesday.

Soybean futures turned lower on poor U.S. soymeal competitiveness, while corn contracts eased as U.S. planting weather improved.

Dry weather and bitter frosts have hit key wheat-growing regions in Russia's south, and some 1.5 million hectares of Russian crops have been damaged by frosts, Russia's Grain Union said.

"Crop issues in Russia are the big story of the moment," said Terry Linn, a broker at Linn and Associates. "We've got a really volatile weather trade."

The most-active wheat contract on the Chicago Board of Trade (CBOT) was up at 8-1/2 cents at $7.05-1/2 a bushel by 1520 GMT.

Consultancy IKAR on Monday further reduced its estimate for Russian wheat production to 81.5 million metric tons and exports to 44 million tons. Only a month ago, IKAR predicted production of 93 million tons and exports of 52 million tons.

Although some rains are expected in a stretch of southern Russia this week, analysts are unsure whether the moisture will be enough to significantly boost the country's harvest.

Soybean prices tumbled as weakness in U.S. soymeal futures dragged the complex down, due largely to cheaper South American meal exports weighing on the market.

Corn futures gained some support from the rally in wheat prices, though speedy planting progress and dry weather forecasts in the U.S. Corn Belt pressured prices early in the session, traders said.

In the U.S., traders will watch for a weekly government report after Tuesday's close to assess the condition of wheat crops and planting progress for corn and soybeans.

CBOT corn was trading down 2 cents at $4.63 a bushel, while soybeans was down 19 cents to $12.29 a bushel. (Reporting by Heather Schlitz in Chicago. Additional reporting by Gus Trompiz in Paris and Peter Hobson in Canberra; Editing by Rashmi Aich, Sherry Jacob-Phillips, Chizu Nomiyama and David Gregorio)