I put about 40 hours into assembling a rifle before going to the range. Go through everything making sure everything is free of stresses even if you have to bed everything like mount to top of action, scope rings , clearance around recoil lug (Front , sides and bottom) also around magazine.
Remember one maker does the receiver and another makes the mount. All the screw tightening will do nothing if only 20% is making contact with each other. When beading, tighten screws just enough to squeeze out the epoxy. That's about as hard as you can screw using your thumb and index finger so as not stress and slightly distort. Some very exact custom actions will bind the bolt when the screws are tightened if beading is poor.
This will save you a lot of time and hopefully all you have to do is find a load. Pick a projectile like a Berger as good jacket concentricity is important for accuracy. Start low , increase powder until it shoots and continue up until it opens up and pick a load in between. now you won't have to waste time fiddling with a dropper just use a good powder measure Next the projectile jump, usually the group will be horizontal or vertical depending if jump is increased or decreased.
Think pin point accuracy, humane one shot kills with least amount of carcass damage.
Hope this helps.