A comparator wouldn't be a bad choice for what you're wanting to do especially if you're going to be using a lot of different bullets until you settle on what you like the best. Myself, I don't load for "uber" accuracy so I haven't ever went that route. But even then, casting your chamber still isn't ill-advised.
Also, the lighter bullets will probably show more accuracy to a point. They're lighter and going to be moving faster. Speed is very often the determining factor of accuracy because it imparts more spin on the bullet. Not unlike a football pass.
But in the same breath, the lighter bullets will see deflection more (and before) from wind/atmosphere changes than the heavier bullets too. So, there's always that too. Plus more mass downrange is better because the lighter bullet is not going to be as effective the farther that it goes, and why all serious shooters want "heavy, long, bullets".
Also, the lighter bullets will probably show more accuracy to a point. They're lighter and going to be moving faster. Speed is very often the determining factor of accuracy because it imparts more spin on the bullet. Not unlike a football pass.
But in the same breath, the lighter bullets will see deflection more (and before) from wind/atmosphere changes than the heavier bullets too. So, there's always that too. Plus more mass downrange is better because the lighter bullet is not going to be as effective the farther that it goes, and why all serious shooters want "heavy, long, bullets".