I set up with a CO2 20lbs can to cool my barrels. It's precise, but it get the job done. I would work up and see by one load for each powder increase. Looking of pressure signs. At the same time you can do a ladder test. I set a very long time ago and did what you are setting up to do. A waste of components. The 0.2 increase is ok on smaller powder chargers, like you are loading for, but only one round and step up. The only other thing, is the powder temp sensitivity? If so you need to see in another test for pressures signs in the summer to see how it reacts to temp. On larger cartridges you can move up .5gr at a time. I will load from the low loading powder loads in a manual and move up. I go until I hit the pressure signs. Heavy lift or ejector marks on a case base. I generally I watch for flatten primers and stop there. I am generally over the high powder loads in the manual at that time anyway. I am somewhat different because of looking for velocity. I note the ladder test and then work on accurate loads. I try and keep my rifles in the 3200 to 3300 fps ranges. Bullet drops are about the same, and I am looking at 500yds max shots.