(Repeats for wider distribution, no changes to text)
By Douwe Miedema
WASHINGTON, Oct 17 (Reuters) - Fresh from a court win in Britain, the London Metal Exchange now faces one of its biggest hurdles yet in its years-long crisis over its warehousing policy that consumers say has inflated prices: convincing U.S. lawmakers its reforms are enough.
When Britain's Court of Appeal handed a victory to the LME last week, knocking out a challenge to the reforms by Russian aluminum giant Rusal last week, the LME's head of business development, Matt Chamberlain, was in Washington, a source familiar with the matter said.
Chamberlain was there to plead the exchange's case with lawmakers who have been pushing for even greater change to the LME's warehouse policy.
Senator Sherrod Brown was among the people the LME visited, a spokeswoman for the Senator said. The Ohio Democrat has been a fierce critic of the LME, urging U.S. regulators to crack down on the 137-year old exchange, and threatening to write rules that would compel regulators to intensify oversight of the exchange on U.S. turf.
Brewers like MillerCoors, which uses aluminum for beer cans, have complained that the LME hasn't done enough over the past four years to tackle excessive stockpiling by warehouses owned by Wall Street banks. They say this has driven up prices.
Now, sources say Brown is pushing for the world's oldest and biggest metals market and its warehousing network to take its most drastic step yet: cap rent that warehouse operators can charge on metal stored in their sheds, discouraging stockpiling by putting a limit on the money to be made from storing.
The lawsuit had forced the LME to halt its reforms, but last week's Court of Appeal decision means it can press ahead with the plan announced last year, telling warehouses they must ship out at least as much metal as they are taking in.
The so-called load-in/load-out (LILO) rule is only one of many planned changes to the rulebook of the LME, which is owned by Hong Kong Exchanges and Clearing Ltd, to help cut down waiting times to 50 days at most.
It also said it will study limiting rents, but experts and the LME have previously said such a far-reaching measure could be deemed anti-competitive.
A source close to the LME cautioned such a measure could present legal difficulties abroad.
"I'd caution that without going into whether a rent cap is legally defensible, it would take the LME into uncharted territory," the source said. "For that reason, among others, it would make the LME vulnerable to challenge from those who may not find a rent cap an attractive proposition."
Still, the IntercontinentalExchange may have shown the way last year for the LME, capping rents charged by coffee and cocoa warehouses in an effort to stop hoarding.
Many metal market participants say the LME may have reached the limit of what it can do: it is caught between producers such as Rusal who fear rule changes could lower aluminum prices, and industrial users who have long complained that prices have been propped up artificially.
Chamberlain's trip to the U.S. capital illustrates the pressure on the LME as it tries to fend off criticism over its handling of the years-long crisis.
"They (the LME) are saying 'we've done everything we can'. This (trip) was to convince senators and regulators that they've done a good job," said the source familiar with the situation.
But U.S. politicans, who have led the effort for change, are still holding out for even tougher oversight.
"It is not an argument (where) the LME does not agree with U.S. Congress, but (about) what ... can practically be delivered," said the source close to the LME.
In Britain, the Financial Conduct Authority, which regulates the LME, has said it will keep a close watch on commodities warehousing to ensure reforms are carried out effectively, but there has been no suggestion of legislative changes.
In the United States, the Commodity Futures Trading Commission holds sway over its business, and the 2010 Dodd-Frank law adopted after the financial crisis requires the agency to renew the LME's U.S. license.
Conflicts between U.S. regulators and U.S. units of global firms are not uncommon. And the CFTC is no stranger to cross-border clashes - after years of talks it is still at odds with European regulators on how to apply a raft of new rules on derivatives.
"The markets don't know the same borders, while regulation ... almost by its very nature, is done locally," said Dan Waldman, a partner at law firm Arnold & Porter, and a former general counsel at the CFTC.
Congress is in the process of reauthorizing the CFTC's mandate and could in principle order the agency to clamp down on the LME by law. Yet while negotiations between the exchange and lawmakers continue behind closed doors, both sides may be closer than they appear in public.
"(The LME has) got to accept that (it's) going to get flak in public," the source close to the LME said. "The real view will be made (known) in private." (Reporting by Douwe Miedema, additional reporting by Josephine Mason in New York)