Obviously a lighter bullet would shoot more flat, providing it was loaded the same and had more velocity.

However, accuracy is another ball game. It would depend on barrel harmonics and twist rate. A lighter bullet will vibrate your barrel at a different frequency than a heavier one will. If your gun likes that bullet it will shoot well with it, maybe better than the heavier one. If your gun doesn't like it, it probably won't be as accurate.

Also twist rate factors in a few things, two being the speed of the bullet and the length of the bullet. A heavier bullet of the same caliber will be longer, and a lighter bullet would be shorter. Depending on the weight difference and length difference the twist in your barrel may not be suited to the particular bullet you are using. This will not help the accuracy any.

The only way to know is to try though. If there is a certain style and weight of bullet you want to use by a box and head to the range. If they group well use them.

Paul