Although I've never tried to have trigger work done on a BLR, I've read that it is quite tricky and that most gunsmiths will shy away from the attempt. BLR's
can be surprisingly accurate, but I don't think Browning ever intended them for the precision shooting crowd. If you're thinking of getting into precision,
or long range shooting, then definitely go with a bolt action, but if you're just trying to improve (and the BLR's trigger is definitely it's weakest attribute)
what is already a fine shooter, then I'd be asking around the Gunsmithing Forum.