The BLRs are highly variable in the accuracy area. I have seen them shoot from just over an inch to 5 inches, depending on the gun The pre 81s benefited from removing the barrel band and glassing the rear stock and forestock but those were not simple jobs. I managed to get a couple to shoot much better that way.
Working up hand loads helps but keep the pressures relatively low and they are one of the few rifles I always FL resized the brass for, using a small base die. Chamber dimensions and barrel quality also varied a great deal. There was a couple that had to be re-barrelled to get them to shoot, the factory barrel had few rounds down them but you just could not get decent groups. As mentioned, the triggers are far from great. There used to be a couple of places that would tune them, a quite complicated process, but I don't know of anyone who still will do it.
The BLR works fine for its intended purpose of being a fast handling rifle, good for 250 yards or less, but it was never designed to be a long range specialist. The odd one would shoot under .75, but even with that accuracy, the gun is not laid out well as a long range platform.
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