There is a fellow in Alberta that was at the Kamloops gunshow and he is making custom swaged 6mm bullets. If you do a search on CGN precision rifles after April 23rd, it should be posted up here. I have no idea if these are any good, but they would be worth looking at for sure.
Alternatively, check with Mysticplayer here. He is importing some funky stuff, perhaps some of the superb 68 gr. bullets Lester Bruno makes for benchrest. I second the vote for Bergers. Great bullets.