* Asian stock markets : https://tmsnrt.rs/2zpUAr4

* MSCI ex-Japan swings higher, Nikkei tries to bounce

* S&P 500 futures ease on doubts over vaccine rollouts

* Retail crowd turns gaze on silver, jumps to 6-mth high

* Dollar supported by cautious mood, bonds brace for supply

By Wayne Cole

SYDNEY, Feb 1 (Reuters) - Asian shares tried to rally on Monday as Wall Street continued to struggle with doubts about vaccine rollouts and economic recovery, while silver surged as newly empowered retail investors turned speculative eyes to precious metals.

MSCI's broadest index of Asia-Pacific shares outside Japan recouped early losses to rise 0.7%, bouncing after four straight sessions of losses.

Japan's Nikkei added 0.8%, after shedding almost 2% on Friday, while Chinese blue chips gained 0.5% as the country's central bank injected more cash into money markets.

Wall Street indexes pared their losses but futures for the S&P 500 were still off 0.3%, while NASDAQ futures fell 0.4%.

Dealers were also warily awaiting new developments in the headline-grabbing battle between retail investors and funds that specialise in shorting stocks.

U.S. hedge funds bought and sold the most stock in more than 10 years amid wild swings in GameStop Corp, according to an analysis by Goldman Sachs Inc.

Talk was that silver was the new target for the retail crowd as the metal jumped 5% to a six-month high.

Yet many analysts see this entertaining episode as a sideshow compared to signs of a loss of momentum in the United States and Europe as coronavirus lockdowns bite.

Indeed, two surveys from China showed factory activity slowed in January as restrictions took a toll in some regions.

Neither was the news on vaccine rollouts positive, especially given doubts about whether they will work on new COVID strains.

"It is these considerations, not what is happening to a video gamer retailer day to day, that has weighed on risk assets," said John Briggs, global head of strategy at NatWest Markets. "So much of the market's valuations, risk in particular, is premised on the fact we can see a light at the end of the COVID tunnel."

Doubts have also emerged about the future of President Joe Biden's $1.9 trillion relief package, with 10 Republican senators urging a $600 billion plan.

The jitters in stocks caused only a brief ripple in bonds with Treasury yields actually rising late last week, perhaps a refection of the tidal wave of borrowing underway.

A record $1.11 trillion of gross Treasury issuance is slated for this quarter, up from $685 billion the same time last year.